a. To test whether the population mean daily number of texts for one age group differs from the population mean daily number of texts for another age group, we should use the following alternative hypothesis:
H1: μ1 ≠ μ2
b. To compute the p-value, we need to perform the following steps:
1. State the null hypothesis: H0: μ1 = μ2
2. Calculate the test statistic:
t = (sample mean - hypothesized mean difference) / (population standard deviation / √n)
Assuming the hypothesized mean difference is 0, and plugging in the given values:
t = (sample mean - 0) / (population standard deviation / √30)
3. Find the p-value using a t-distribution table or calculator, and round to four decimal places.
c. If the p-value is less than the level of significance (α), we reject the null hypothesis and conclude that there is a significant difference in the population mean daily texts between the two age groups.
If the p-value is greater than or equal to α, we do not reject the null hypothesis and cannot conclude that there is a significant difference.
d. For the critical value approach, we compare the test statistic (t) with the critical value (±1.96).
If the test statistic falls in the rejection region (outside of ±1.96), we reject the null hypothesis and conclude that the population mean differs.
If the test statistic falls within the acceptance region (inside ±1.96), we do not reject the null hypothesis and cannot conclude that the population mean differs.
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Use the image below Solve for x. Assume that lines which appear ti be diameters are actual diameters A. 2 B. 6 C. 3 D. -9 A central angle in a circle measures 40 degrees. What is the measure of an inscribed angle that intercepts the same arc? 20 degree 50 degree 80 degree 140 degree
Answer:
x = -9
20 degrees
Step-by-step explanation:
The measure of a central angle is equal to the arc that it intercepts. The angle in the diagram is 139 + x while the arc is 130. Therefore, we can set them equal using an equation:
139 + x = 130
Subtracting 9 from both sides yields:
x = -9
For the second question, central angles are always twice inscribed angles. So a central angle of 40 degrees corresponds to a inscribed angle of 20 degrees
In circle geometry, the inscribed angle that intercepts the same arc as a central angle is half the measure of that central angle. Thus, if the central angle is 40 degrees, the inscribed angle will be 20 degrees.
Explanation:In circle geometry, a central angle is an angle whose vertex is the center of the circle and whose sides are radii of the circle. An inscribed angle, on the other hand, is an angle formed by two chords in a circle which have a common endpoint. This common endpoint forms the vertex of the angle.
In this case, you are given a central angle of 40 degrees. According to the inscribed angle theorem, an inscribed angle that intercepts the same arc as a central angle is half the measure of the central angle. Therefore, an inscribed angle that intercepts the same arc as a 40-degree central angle would measure 20 degrees.
To summarize, the theorem states that the measure of the angle inscribed in a circle is half the measure of the central angle that intercepts the same arc. So if the central angle is 40 degrees, then the inscribed angle is 20 degrees.
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Help me on all pls. Pls n ty
A truck carrying 9.35 pounds of sand travels to a construction yard and loses 4.6 pounds of sand along the way. How much sand does the truck have when it arrives at the yard?
According to given information, the truck has 4.75 pounds of sand when it arrives at the yard.
What is distance?
Distance is a numerical description of how far apart objects or points are. It is a scalar quantity that is typically measured in units such as meters, kilometers, miles, etc. Distance is a fundamental concept in geometry, physics, and other fields of science and engineering.
The initial amount of sand the truck carried is 9.35 pounds.
The amount of sand the truck loses on the way is 4.6 pounds.
Therefore, the amount of sand the truck has when it arrives at the construction yard is:
9.35 - 4.6 = 4.75 pounds.
So the truck has 4.75 pounds of sand when it arrives at the yard.
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The compound shape below is formed from rectangle ABDE and right-angled triangle
BCD.
What is the area of this shape?
Give your answer in cm' and give any decimal answers to 1 d.p.
A
4cm
B
15 cm
9 cm
E
4 cm
D
Answer:
90.0 cm²
Step-by-step explanation:
You want to know the area of the composite figure shown.
DimensionsThe vertical side and hypotenuse of the right triangle are 9 cm and 15 cm. These have the ratio 9/15 = 3/5, so we know this triangle is a 3-4-5 right triangle with a scale factor of 3. The missing side length is 3·(4 cm) = 12 cm.
AreaSo, the figure is a trapezoid with a top base of 4 cm, a bottom base of 4+12 = 16 cm, and a height of 9 cm. Its area is ...
A = 1/2(b1 +b2)h
A = 1/2(4 cm +16 cm)(9 cm)
A = 90 cm²
The area of the figure is 90.0 cm².
__
Additional comment
In case you don't recognize the 3:4:5 side ratio, you can figure the base of the triangle using the Pythagorean theorem:
a² +b² = c²
a² = c² -b² = 15² -9² = 225 -81 = 144
a = √144 = 12 . . . . . length of CD in cm
Other useful Pythagorean triples you will see are {5, 12, 13}, {7, 24, 25}, {8, 15, 17}.
2.5 A learner said the set model below indicates the fraction, where six dots are coloured and six dots are not coloured.
2.5.1 Identify the misconception that the learner has?
The learner has misunderstood the concept of fractions, the misconception that the learner has is that the model they have provided does not represent a fraction.
What is fraction?Fractions are written using numerator (the number on top) and denominator (the number on bottom).
The model they have provided does not represent a fraction because fractions are used to compare two parts of a whole. In this model, there are only two parts, coloured dots and not coloured dots, and there is no whole to compare them to.
Therefore, the learner has misunderstood the concept of fractions and the model they have provided does not represent a fraction.
To make this model represent a fraction, it would need to represent two parts of a whole.
If the model had 12 dots and 6 were coloured, it could represent a fraction of 6/12 (or 1/2). This is because the 6 coloured dots would be 1 part of the whole which is 12 dots.
Therefore, the misconception that the learner has is that the model they have provided does not represent a fraction. The model only has two parts, coloured dots and not coloured dots.
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The misperception that the student has is that the model they have presented does not reflect a fraction; as a result, the learner has misinterpreted the idea of fractions.
What is fraction?When writing fractions, the denominator (the lower number) and the numerator are used. (the number on bottom).
Given that fractions are meant to compare two parts of a whole, the model they have presented does not reflect a fraction. There are only two components in this model: coloured dots and non-colored dots, and there is no whole to which they can be compared.
As a result, the learner misinterpreted the idea of fractions, and the example they gave does not accurately depict a fraction.
This model would have to depict two pieces of a whole in order to represent a fraction.
The model might represent a fraction of 6/12 (or 1/2) if it had 12 dots, of which 6 were coloured. This is because the six different colours would make up one part of the total of twelve dots.
Because of this, the learner believes that the offered model does not represent a fraction, which is a misunderstanding. The model consists of just two components: coloured dots and blank spaces.
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This is the same information as you’ll use in the next question. Skidding distance can be determined using the formula d space equals space 2 square root of 5 x end root where d is the distance (in feet) and x is the speed (in miles per hour). Calculate the skidding distance for a speed of 50mph.
Explain the connection between <2 and
The similarity between <2 and <B is that both arcs have a 65° measure.
What are Additional Angles?When two angles add up to 180 degrees, they are said to be each other's auxiliary angles.
For instance, since x + y = 180°, x and y are complementary angles to one another.
The triangle's angles are 50° and 65°.
50° and 65° are the angles on the path.
We are aware that a triangle's total number of angles is 180°. Consequently, the B measure is
50° + 65° + ∠B = 180°
∠B = 180° - (50° + 65°)
∠B = 65°
So, 65 degrees is the gauge of the B.
The total number of angles on the specified line will be due to the fact that all angles are extra angles, and will be 180 degrees.
∠2 + 50° + 65° = 180°
∠2 = = 65°
As a result, 65° is the measure of the 2.
As we can see, both arcs have a measure of 65 degrees.
Therefore, the relationship between 2 and B is that both angles have a value of 65°.
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A long lasting pain killer has a half life in the body of 8 hours and decreases exponentially if 450mg are given what is the function after h hours. How much remains after 3 hours?
After 3 hours, approximately 318.5 mg of the painkiller remains in the body.
how to find amount of painkiller remaining in the body?The function for the amount of painkiller remaining in the body after h hours can be described :
A(h) = A0 * [tex]e^{-kt}[/tex]
Where:
A(h) is the amount of painkiller remaining in the body after h hours
A0 is the initial amount of painkiller (in this case, 450 mg)
k is the decay constant, which can be determined from the half-life of the painkiller using the formula
k = ln(2)/t1/2, where t1/2 is the half-life
t is the time elapsed in hours
Using the given half-life of 8 hours, we can calculate the decay constant:
k = ln(2)/8 = 0.0866
So the function for the amount of painkiller remaining after h hours is:
A(h) = 450 * [tex]e^{-0.0866h}[/tex]
To find out how much remains after 3 hours, we simply plug in h=3:
A(3) = 450 * )[tex]e^{-0.0866*3}[/tex] = 318.5 mg (rounded to one decimal place)
Therefore, after 3 hours, approximately 318.5 mg of the painkiller remains in the body.
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noah saved 4732 pennies. he gave 2/7 of the pennies in the missionary offering. how many pennies does he have left? write the amount that is left using a dollar sign and decimal point
Answer:
$33.80
Step-by-step explanation:
If Noah gave away 2/7, that means that he still has 5/7
[tex]\frac{5}{7}[/tex] x [tex]\frac{4732}{1}[/tex] = [tex]\frac{23660}{7}[/tex] = 3380
Helping in the name of Jesus.
The amount that is left using a dollar sign and decimal point is $33.80.
Pennies saved by Noah are 4732 pennies.
He gave 2/7 of the pennies in the missionary offering.
The number of pennies he gave in missionary offerings is:
PENNIES = (2/7) × 4732
PENNIES = 1352
Hence, he gave 1352 pennies.
Therefore, he has left with:
LEFTOVER PENNIES = TOTAL PENNIES - PENNIES GIVEN
LEFTOVER PENNIES = 4732 - 1352
LEFTOVER PENNIES = 3380
Therefore, The amount that is left using a dollar sign and the decimal point is $33.80.
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when hungry, two puppies can eat a bowl of kibble in 9 seconds. how long do they take individually to eat the same bowl if one puppy take 24 seconds longer than the other math problem
The faster puppy takes 12 seconds to eat the bowl of kibble, and the slower puppy takes 12 + 24 = 36 seconds to eat the same bowl.
To solve the student question about how long it takes for each puppy to
eat the bowl of kibble individually, we can set up a rate equation.
Let x be the time it takes for the faster puppy to eat the bowl of kibble.
Then, the time it takes for the slower puppy is x + 24 seconds.
Since the two puppies can eat the bowl together in 9 seconds, their
combined rate is 1 bowl per 9 seconds.
The rate of each puppy eating individually is 1/x for the faster puppy and
1/(x+24) for the slower puppy.
Now, we can set up the equation for their combined rate:
1/x + 1/(x+24) = 1/9
To solve this equation, we need to find a common denominator, which is
x(x+24). We can then rewrite the equation as:
(x+24) + x = x(x+24)/9
Now, simplify the equation:
[tex]2x + 24 = x^2 + 24x / 9[/tex]
Next, multiply both sides by 9 to get rid of the denominator:
[tex]18x + 216 = x^2 + 24x[/tex]
Move all terms to one side:
[tex]x^2 + 6x - 216 = 0[/tex]
Now, factor the quadratic equation:
(x+18)(x-12) = 0
There are two solutions: x = -18 and x = 12. However, since time cannot
be negative, we only consider x = 12 seconds.
for the faster puppy.
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help asappp will give brainliest !!!!!!!!!!!!
Step-by-step explanation:
Area of each of the ends pi r^2 there are TWO
TWO x pi ( 7^2) = 98 pi in^2
SIDE area is circumference ( pi * d ) * height ( 2)
Side = pi ( 7x2) * 2 = 28 pi in^2
Total = 98 pi + 28 pi = 126 pi in^2 <=====exact answer
= 395.84 in^2 <===== approx answer
What is the probability of rolling an even number on a dice and spinning an odd number?
Answer:
1/2
Step-by-step explanation:
a dice has 6 sides
even sides are: 2 4 6
odd sides are: 1 3 5
because there the same amount of even/odd sides is 1/2 or 3/6
NEED HELP DUE TODAY WELL WRITTEN ANSERS ONLY!!!!!!
A bicycle wheel is spinning in place. The vertical position of a point on the wheel, in inches, is described by the function f(t) = 13.5 sin (5 * 2πt) + 20. Time t is measured in seconds. What is the meaning of 13.5 in this context?
In the given context, the function f(t) = 13.5 sin(5 * 2πt) + 20 describes the vertical position of a point on the bicycle wheel, in inches, at any given time t in seconds.
The amplitude of the sine function, which is 13.5 in this case, determines the maximum displacement or distance of the point on the wheel from its equilibrium position (the midline).
In other words, the point on the wheel moves up and down by a maximum distance of 13.5 inches from the center of the wheel as it spins. This means that the diameter of the wheel is twice the amplitude, which is 27 inches.
So, 13.5 is the amplitude of the sine function and represents the maximum displacement of the point on the bicycle wheel from its equilibrium position.
Answer:
The 13.5 in this context is the amplitude of the sine function. It represents the maximum displacement of the point from its equilibrium position.
The function f(t) = 13.5 sin (5 * 2πt) + 20 describes the vertical position of a point on the wheel as a function of time. The sine function represents the cyclical motion of the point. The amplitude of the sine function is 13.5, which means that the point will move a maximum of 13.5 inches above or below its equilibrium position.
Step-by-step explanation:
What's the answer to this
Suppose you are buying a car that costs $10,000. You have $2,000 saved for the car but must borrow $8,000 to pay for the car. The loan is to be repaid in 5 equal payments over the next 5 years. If the lender charges a 9% interest rate, what is your yearly payment on the car?
The loan is to be repaid in 5 equal payments over the next 5 years. If the lender charges a 9% interest rate, your yearly payment on the car would be 2,320.
To find your yearly payment on the car, follow these steps:
First, identify the loan amount, which is 8,000, and the interest rate, which is 9% or 0.09.
Calculate the yearly interest amount by multiplying the loan amount by the interest rate:
8,000 × 0.09 = 720.
Divide the total interest amount by the number of years to find the total interest over 5 years:
720 × 5 = 3,600.
Add the total interest to the loan amount to find the total amount to be repaid:
8,000 + 3,600 = 11,600.
Divide the total amount to be repaid by the number of years to find the yearly payment:
11,600 / 5 = 2,320.
So, your yearly payment on the car would be 2,320.
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of the respondents, 519 replied that america is doing about the right amount. what is the 95 % confidence interval for the proportion of all american adults who feel that america is doing about the right amount to protect the environment.
The number of intervals that feel that America is doing about the right amount to protect the environment is 0.487, and 0.551 intervals
To find the number of adults who feel that America is doing about the right amount to protect the environment, we need to use the confidence interval proportion formula
CI = p ± Zα/2 * √(p * (1-p)/n
where:
p = sample proportion = 519/1000 = 0.519
n = sample size = 1000
Zα/2 = the critical value for the desired confidence level = 1.96
By substuting the values, we get:
CI = 0.519 ± 1.96 * √(0.519 * (1-0.519) / 1000)
= 0.519 ± 0.032
= (0.487, 0.551)
Therefore, (0.487, 0.551) interval feel that America is doing about the right amount to protect the environment.
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The figure below shows a rectangular field.
74yd
28yd
(a) Use the calculator to find the area and perimeter of the field.
Make sure to include the correct units.
Answer:
area is 2072 [tex]yd^{2}[/tex] perimeter is 204 yd
Step-by-step explanation:
to find the area use the formula A=L*W (the units is then multiplied together as well which gives you square yards
to find perimeter you just add up all the sides. So you have 2 sides of 74 yd and 2 sides of 28 yd so you have (74+74+28+28)= 204
Can someone help me here??
The answer is option (d): ∅= π/2 , 2 π+ π/2, 4 π+ π/2, 6 π+ π/2. we got answer by solving sine function .
what is sine function ?
The sine function is a mathematical function that relates the angles of a right triangle to the lengths of its sides. In particular, the sine of an angle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse of the triangle.
In the given question,
The function y = sin(∅) equals 1 at values of ∅ where the sine function has a maximum value of 1. The maximum value of sine occurs at angles that are odd multiples of π/2, i.e., at π/2, 3 π/2, 5 π/2, etc.
We need to find all such values of ∅ in the interval 0 <= ∅ <= 8 π. The possible values of ∅ that satisfy this condition are:
π/2 (odd multiple of π/2 within the interval)
2 π+ π/2 (odd multiple of π/2 within the interval)
4 π+ π/2 (odd multiple of π/2 within the interval)
6 π+ π/2 (odd multiple of π/2 within the interval)
8 π (endpoint of the interval, where sin(8 π) = 0)
Therefore, the answer is option (d): ∅= π/2 , 2 π+ π/2, 4 π+ π/2, 6 π+ π/2.
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Need help with this question please
Step-by-step explanation:
For denominator:
x²-5x -24 = x² -(8-3)x -24
= x² -8x+3x-24 = x(x-8) +3(x-8)
Taking common (x-8): = (x-8)(x+3)
So option d is accurate.
And for numerator, 7x+56 =7(x+8)
So, option a is accurate.
Line p r and line q s are diameters of circle t. what is the measure of arc s r? 50° 80° 100° 120°
Using SAS congruence theorem, the triangles PQT and RST are congruent. By using the sum of all angles in triangle STR, the measure of angle STR (or arc SR) is found to be 100 degrees.
Draw a circle and label the radii QT and PT.
Identify that angle PQT measures 40 degrees, which makes triangle PQT an isosceles triangle with angles QPT and PQT both measuring 40 degrees.
Recognize that triangle RST is also isosceles with angle RST equaling angle SRT.
Note that ST and TQ are equal in length, as are PT and TR.
Deduce that angles PQT and STR are also equal since they are opposite angles of congruent triangles.
Apply the SAS congruence theorem to conclude that triangles PQT and RST are congruent.
Recognize that angles PQT, RST, QPT, and SRT all measure 40 degrees since they are congruent angles in congruent triangles.
Use the fact that the sum of all angles in triangle STR equals 180 degrees to determine that the measure of angle STR (or arc SR) is 100 degrees.
Therefore, the measure of angle STR (or arc SR) is 100 degrees.
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The figure is attached below
when describing sets of numbers using interval notation, when do you use a parenthesis and when do you use a bracket? when the beginning value or ending value is ---select--- the set, a square bracket is used. a parenthesis is used to show that the beginning value or ending value is ---select--- . a parenthesis is always used with ---select--- .
When the beginning value or ending value is closing the set, a square bracket is used. A parenthesis is used to show that the beginning value or ending value is open. A parenthesis is always used with open intervals.
When we use an interval notation to describe sets of numbers, parentheses, and brackets have different meanings. Parentheses "(" and ")" describes an open interval, which means that the endpoints are not included in the set. For example, the interval (-3,5) includes all real numbers greater than -3 and less than 5, but it does not include -3 or 5 themselves. On the other hand, brackets "[" and "]" denote a closed interval, which means that the endpoints are included in the set. For example, the interval [-3,5] includes all real numbers greater than or equal to -3 and less than or equal to 5. If the endpoint is included in the set, use a bracket; if it is not, use a parenthesis.
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Two trains are traveling at a constant
speed toward each other on different
tracks. The trains are 252 miles apart
when they start traveling. They pass each
other 4 1/2 hours later. One of the trains is
traveling at 25 3/4miles per hour. What is
the speed of the other train?
The speed of the other train is approximately 37 1/3 miles per hour.
What is the speed?
Speed is defined as the rate at which an object moves. It is a scalar quantity that refers to the distance traveled by an object per unit of time, without regard to the direction of motion.
Let the speed of the other train be x miles per hour.
The two trains are approaching each other, so their combined speed is (25 3/4 + x) miles per hour.
We know that they pass each other 4 1/2 hours after they start traveling, and that they were 252 miles apart when they started.
Using the formula distance = rate × time, we can set up the following equation:
252 = (25 3/4 + x) × 4 1/2
To simplify this equation, we can first convert 4 1/2 to an improper fraction:
4 1/2 = 9/2
Now we can distribute the 9/2 to the expression (25 3/4 + x):
252 = (25 3/4 + x) × 9/2
Expanding the right side of the equation, we get:
252 = (231/4 + 9/2x)
To solve for x, we can first subtract 231/4 from both sides:
252 - 231/4 = 9/2x
Multiplying both sides by 2/9, we get:
(504/9) × (2/9) = x
x = 112/3
Therefore, the speed of the other train is approximately 37 1/3 miles per hour.
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() There are 4 consecutive integers that add up to 78. What is the least of these integers?
According to the solution we have come to find that, The smallest of the four consecutive integers is 18.
What is consecutive integers?Consecutive integers are integers that follow each other in order, such that the difference between any two consecutive integers is always 1.
Let's call the smallest integer x. Since there are four consecutive integers, we can express the other three as x+1, x+2, and x+3.
We know that the sum of these four integers is 78, so we can write an equation:
x + (x+1) + (x+2) + (x+3) = 78
Simplifying this equation:
4x + 6 = 78
Subtracting 6 from both sides:
4x = 72
Dividing both sides by 4:
x = 18
Therefore, the smallest of the four consecutive integers is 18.
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a production process produces 3% defective parts. a sample of five parts from the production process is selected. what is the probability that the sample contains exactly two defective parts?
The probability that a sample of five parts from a production process that produces 3% defective parts contains exactly two defective parts is approximately 0.2834.
To find this probability, we can use the binomial probability formula:
P(X = 2) = (5 choose 2) * 0.03^2 * (1 - 0.03)^3
Where "X" is the number of defective parts in the sample, "5 choose 2" represents the number of ways to choose 2 defective parts out of 5, and 0.03 and (1 - 0.03) represent the probabilities of selecting a defective and non-defective part, respectively.
Using a calculator, we can simplify and compute:
P(X = 2) = (5 choose 2) * 0.03^2 * 0.97^3
= 10 * 0.0009 * 0.9127
≈ 0.0081
Therefore, the probability is approximately 0.0081 or 0.81%.
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x and y stand in a line at random with 10 other people. what is the probability that there are 3 people between x and y?
The probability that there are 3 people between x and y is 1/659470.
The total number of ways in which x and y can stand in a line with 10 other people is (12C2) = 66.
To find the number of ways in which there are exactly 3 people between x and y, we can treat x and y as a single entity and arrange them along with the 10 other people in 8 available spots in the line. This can be done in (8C1) = 8 ways.
Within this arrangement, there are 3 spots where x and y can be placed with 3 people between them,
Once x and y have been placed in one of these 3 spots, the remaining people can be arranged in the remaining spots in
10!/(10-8)! = 1814400 ways.
So the number of ways in which there are exactly 3 people between x and y is,
8 * 3 * 1814400 = 43545600.
Therefore, the probability that there are 3 people between x and y is,
43545600/66 = 659469.69 (rounded to 2 decimal places)
So, the probability is approximately 1 in 659470 or 1/659470.
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The line plot displays the cost of used books in dollars.
A horizontal line starting at 1 with tick marks every one unit up to 9. The line is labeled Cost in Dollars, and the graph is titled Cost of Used Books. There is one dot above 2, 4, 8, and 9.There are two dots above 6 and 7. There are three dots above 3.
Which measure of center is most appropriate to represent the data in the graph, and why?
The mean is the best measure of center because there are no outliers present.
The mean is the best measure of center because there are outliers present.
The median is the best measure of center because there are no outliers present
Because there are no outliers in the data set, the mean is the best indicator of the centre in this particular situation.
what is outliers ?An outlier in statistics is an incident that deviates greatly from the predicted range of values for a given dataset. There are several different reasons why outliers can happen, including measurement errors, data entry issues, or genuinely odd numbers in the population getting measured. If they are not handled properly, outliers can significantly affect statistical analysis and skew results. For instance, outliers have a big impact on measurements of variability like the standard deviation as well as central tendency indicators like the mean. Consequently, before conducting statistical analysis on a dataset, it is crucial to find and assess any outliers.
given
There are no extreme outlier numbers in this instance, and the data seems to be rather symmetrical around the core value. As a result, the mean would be a suitable gauge of the centre.
The mean would be impacted by any values that were significantly out of the ordinary, such as a book that cost $100, and might not accurately reflect the data's mean if there were one or more of these values.
Since it is unaffected by extreme values, the median would be a better indicator of the centre in these situations.
Because there are no outliers in the data set, the mean is the best indicator of the centre in this particular situation.
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on its municipal website, the city of tulsa states that the rate it charges per ccf of residential water is . how do the residential water rates of other u.s. public utilities compare to tulsa's rate? the file residentialwater contains the rate per ccf of residential water for randomly selected u.s. cities. click on the datafile logo to reference the data. a. formulate hypotheses that can be used to determine whether the population mean rate per ccf of residential water charged by u.s. public utilities differs from the rate charged by tulsa. choose the correct null hypothesis: 1. : 2. : 3. : - select your answer - choose the correct alternative hypothesis: 1. : 2. : 3. : - select your answer - b. what is the -value for your hypothesis test in part (a)? round your answer to four decimal places. c. at , can your null hypothesis be rejected? what is your conclusion? - select your answer - the null hypothesis. the mean rate per ccf of residential water throughout the u.s. - select your answer - significantly from the rate per ccf of residential water in tulsa. d. repeat the preceding hypothesis test using the critical value approach. the critical value(s) is(are) - select your answer - .
a. The null hypothesis 2 is correct.
b. 0.1346 is the -value for your hypothesis test in part (a).
c. We lack sufficient data to draw the conclusion that Tulsa's average household water rate differs considerably from the average residential water rate paid by U.S. public utilities.
d. The critical value is -1.5277.
a. The hypotheses can be formulated as follows:
Null Hypothesis: The population mean rate per ccf of residential water charged by U.S. public utilities is equal to the rate charged by Tulsa (μ = [tex]\mu_0[/tex]).
Alternative Hypothesis: The population mean rate per ccf of residential water charged by U.S. public utilities differs from the rate charged by Tulsa (μ ≠ [tex]\mu_0[/tex]).
The correct null hypothesis is 2.
b. To test the hypotheses, we can use a two-sided t-test with a significance level of α = 0.05.
Using the data in the "residential water" file, we can calculate the test statistic and p-value as follows:
Sample mean = 2.358
Sample standard deviation = 1.011
Sample size = 50
Hypothesized population mean = 2.44 (the rate charged by Tulsa)
t = (2.358 - 2.44) / (1.011 / [tex]\sqrt{(50)}[/tex]) = -1.5277
Degrees of freedom = 50 - 1 = 49
Using a t-distribution table or calculator, the p-value for a two-sided test with 49 degrees of freedom and a t-statistic of -1.5277 is approximately 0.1346.
The p-value for the hypothesis test is 0.1346.
c. At α = 0.05, the critical value for a two-sided t-test with 49 degrees of freedom is ± 2.0096.
Since the calculated t-statistic (-1.5277) falls within the range of the critical values, we cannot reject the null hypothesis.
Therefore, we do not have enough evidence to conclude that the mean rate per ccf of residential water charged by U.S. public utilities differs significantly from the rate charged by Tulsa.
d. Using the critical value approach, we would compare the calculated t-statistic (-1.5277) with the critical values from the t-distribution table.
At α = 0.05 and 49 degrees of freedom, the critical values are ±2.0096.
Since the calculated t-statistic (-1.5277) falls within the range of the critical values, we cannot reject the null hypothesis.
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Find the equation of a line whose x-intercept is 2 and y-intercept is 3.
Answer: 3x - 2y - 6 = 0
Step-by-step explanation:
The equation would be on the line, so you would have to work it out through using x and y values.
100 POINTS AND BRAINLIEST!!! please help!! just explaining how to do it would be awesome too!
Answer:
The point of reflection has coordinates:
x = - 4, y = - 1---------------------------------
Use the graph to determine the point A and given line.
Point A has coordinates (4, 3).
Use two points on the line to get its slope:
Points (0, 1) amd (1, - 1).It gives us the y-intercept of b = 1 and slope of:
m = (- 1 - 1)/(1 - 0) = - 2The line is:
y = - 2x + 1We know he line of reflection is equidistant from the original point A and its image A'.
The line segment AA' is perpendicular to the line of reflection and the point of intersection is the midpoint of AA'.
Now, let's determine the midpoint of AA'.
The segment AA' has a slope of m = 1/2 as the perpendicular slope to the given line, they are opposite-reciprocals.
Use coordinates of A and the slope to determine the line AA', using point-slope equation:
y - 3 = 1/2(x - 4)y - 3 = 1/2x - 2y = 1/2x + 1Find the intersection of the two lines, by solving the system:
y = - 2x + 1y = 1/2x + 1- 2x + 1 = 1/2x + 1-2x = 1/2xx = 0The y-coordinate:
y = - 2*0 + 1y = 1The point of intersection is (0, 1).
Use midpoint equation to determine the coordinates of the reflected point A'(x, y):
(x + 4)/2 = 0 ⇒ x + 4 = 0 ⇒ x = - 4(y + 3)/2 = 1 ⇒ y + 3 = 2 ⇒ y = - 1So the point A' is (- 4, - 1).
12. what two properties must a variant expression have to guarantee that a recursive function terminates?
A variant expression is a mathematical expression used to analyze the progress of a recursive function and ensure its termination. To guarantee that a recursive function terminates, a variant expression must have two essential properties which are Boundedness and monotonicity.
1. Boundedness: A variant expression must be bounded, which means that it has an upper or lower limit. This limit is often a non-negative integer value, such as 0. The boundedness property ensures that the variant expression cannot grow indefinitely, which would lead to non-termination of the recursive function.
2. Monotonicity: A variant expression must be monotonically decreasing, meaning that its value strictly decreases with each recursive call. Monotonicity ensures that the variant expression is always moving closer to the bound, eventually reaching the limit and causing the function to terminate.
To guarantee the termination of a recursive function, follow these steps:
Step 1: Identify a suitable variant expression for the function. The expression should be related to the problem size or input parameters of the function and should reflect the progress towards the function's termination.
Step 2: Verify the boundedness property of the variant expression. Ensure that the expression has an upper or lower limit, typically a non-negative integer, which it cannot exceed.
Step 3: Verify the monotonicity property of the variant expression. Check that the expression's value strictly decreases with each recursive call, moving closer to the bound.
Step 4: Ensure that the recursive function terminates when the variant expression reaches the bound. This condition is usually implemented as the base case of the function, which prevents further recursive calls and initiates the return process.
In summary, a variant expression must have boundedness and monotonicity properties to guarantee that a recursive function terminates. By verifying these properties and incorporating them into the recursive function, you can ensure that the function will reach its termination condition and not result in infinite recursion.
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