Deck 9: Hypothesis Testing

Question 1

A test is made of . A sample of size n = 67 is drawn, and . The population standard deviation is . Compute the value of the test statistic z.

A) 0.15
B) -1.02
C) -5.01
D) -0.12

Answer 1

-1.02

Question 2

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 25 miles per gallon (mpg). A random sample of 57 cars are selected and the air filter of each is replaced with
A new one. Let be the population mean fuel efficiency score that would occur if every car's air
Filter were replaced. The air filter change is deemed effective if mpg. A test is made of . Consider these possible conclusions:
i. The air filter changes are effective.
ii. The air filter changes are not effective.
iii.. The air filter changes might not be effective.
Which of the three conclusions is best if is not rejected?

A) ii
B) i
C) iii

Answer 2

iii

Question 3

A test is made of versus . A sample of size n=60 is drawn, and The population standard deviation is . Compute the value of the test statistic z and determine if is rejected at the level.

A) 0.22, not rejected
B) 1.68, rejected
C) 0.22, rejected
D) 1.68, not rejected

Answer 3

1.68, not rejected

Question 4

A new organic pest control formula is being tested on potato plants to see whether it can reduce the level of potato beetle infestation. The mean number of beetles per untreated plant is 8. It is hoped That the new formula may reduce this infestation rate. State the appropriate null and alternate
Hypotheses.

A)
B)
C)
D)

Question 5

A garden supplier claims that its new variety of giant tomato produces fruit with a mean weight of 38 ounces. A test is made of versus . The null hypothesis is rejected. State the
Appropriate conclusion.

A) There is not enough evidence to conclude that the mean weight is 38 ounces.
B) The mean weight is equal to 38 ounces.
C) There is not enough evidence to conclude that the mean weight differs from 38 ounces.
D) The mean weight is not equal to 38 ounces.

Question 6

A garden supplier claims that its new variety of giant tomato produces fruit with a mean weight of 42 ounces. A test is made of . The null hypothesis is not rejected. State
The appropriate conclusion.

A) There is not enough evidence to conclude that the mean weight is 42 ounces.
B) The mean weight is not equal to 42 ounces.
C) The mean weight is equal to 42 ounces.
D) There is not enough evidence to conclude that the mean weight differs from 42 ounces.

Question 7

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 24 miles per gallon (mpg). A random sample of 44 cars are selected and the air filter of each is replaced with a new one. Let = be the population mean fuel efficiency score that would occur if every car's air filter were replaced. The air filter change is deemed effective if >24 mpg. A test is made of versus https://d2lvgg3v3hfg70.cloudfront.net/TB34225555/. Consider these possible conclusions:
i. The air filter changes are effective.
ii. The air filter changes are not effective.
Iii. The air filter changes might not be successful.
Which of the three conclusions is best if is rejected?

A) iii
B) ii
C) i

Question 8

A sample of 50 chewable vitamin tablets have a sample mean of 300 milligrams of vitamin C. Nutritionists want to perform a hypothesis test to determine how strong the evidence is that the
Mean mass of vitamin C per tablet differs from 297 milligrams. State the appropriate null and
Alternate hypotheses.

A)
B)
C)
D)

Question 9

Determine whether the outcome is a Type I error, a Type II error, or a correct decision. A test is made of H₀: μ=48 versus H1:μ≠ 48. The true value of is 48 and H0 is not rejected.

A) Correct decision
B) Type I error
C) Type II error

Question 10

A grocery store owner claims that the mean amount spent per checkout is more than $74. A test is made of . The null hypothesis is rejected. State the appropriate
Conclusion.

A) The mean checkout amount is greater than $74.
B) There is not enough evidence to conclude that the mean checkout price is greater than $74.
C) The mean checkout amount is less than or equal to $74.
D) There is not enough evidence to conclude that the mean checkout price is less than or equal to $74.

Question 11

A sample of 60 chewable vitamin tablets have a sample mean of 275 milligrams of vitamin C. Nutritionists want to perform a hypothesis test to determine how strong the evidence is that the
Mean mass of vitamin C per tablet exceeds 272 milligrams. State the appropriate null and alternate
Hypotheses.

A)
B)
C)
D)

Question 12

A test of versus is performed using a significance level of =0.05. The value of the test statistic is z=-1.81. Is rejected?

A) Yes
B) No
C) It cannot be determined.

Question 13

A test is made of versus . A sample of size n=76 is drawn, and . The population standard deviation is https://d2lvgg3v3hfg70.cloudfront.net/TB34225555/. Compute the value of the test statistic z and determine if is rejected at the level.

A) 0.16, H₀ rejected
B) 1.39, H₀ rejected
C) 1.39, H₀ not rejected
D) 0.16, H₀ not rejected

Question 14

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 23.4 miles per gallon (mpg). A random sample of 41 cars are selected and the air filter of each is replaced with
A new one. Let μ be the population mean fuel efficiency score that would occur if every car's air
Filter were replaced. The air filter change is deemed effective if mpg. A test is made of Assume that the air filter changes are effective but the conclusion is reached that the changes might not be
Effective. Which type of error, of any, has occurred?

A) Type II
B) No error - correct decision
C) Type I
D) Mechanical failure

Question 15

A test is made of versus A sample of size n=67 is drawn, and =45 . The population standard deviation is =29 . Compute the value of the test statistic

A) 0.14
B) 1.13
C) 6.08
D) 0.87

Question 16

Determine whether the alternative hypothesis is left-tailed, right-tailed, or two-tailed.

A) two-tailed
B) right-tailed
C) left-tailed

Question 17

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 24.3 miles per gallon (mpg). A random sample of 43 cars are selected and the air filter of each is replaced with
A new one. Let μ be the population mean fuel efficiency score that would occur if every car's air
Filter were replaced. The air filter change is deemed effective if . A test is made of Assume that the air filter changes are not effective. Which type of error is impossible?

A) Type I
B) Type II

Question 18

Determine whether the outcome is a Type I error, a Type II error, or a correct decision. A test is made of H₀:μ=62 versus H₁:μ≠62
The true value of is 64 and H₀ is rejected.

A) Type I error
B) Type II error
C) Correct decision

Question 19

A grocery store owner claims that the mean amount spent per checkout is more than $85. A test is made of . The null hypothesis is not rejected. State the appropriate
Conclusion.

A) The mean checkout amount is less than or equal to $85.
B) There is not enough evidence to conclude that the mean checkout price is less than or equal to $85.
C) The mean checkout amount is greater than $85.
D) There is not enough evidence to conclude that the mean checkout price is greater than $85.

Question 20

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 25.2 miles per gallon (mpg). A random sample of 59 cars are selected and the air filter of each is replaced with
A new one. Let μ be the population mean fuel efficiency score that would occur if every car's air Filter were replaced. The air filter change is deemed effective if mpg. A test is made of Assume that the air filter changes are effective. Which type of error is impossible?

A) Type I
B) Type II

Question 21

A test of H₀: =57 versus H₁: 57 is performed using a significance level of :=0.05. The P-value is 0.138 . Is H₀ rejected?

A) It cannot be determined.
B) Yes
C) No

Question 22

A) Type I error
B) Type II error
C) Correct decision

Question 23

Alice will perform a hypothesis test at the =0.05 level. Bob will perform the same test at the = 0.01 level. If H₀ is true, who has the greater probability of making a type I error?

A) Alice
B) Bob
C) Neither

Question 24

A) Correct decision
B) Type I error
C) Type II error

Question 25

The Golden Comet is a hybrid chicken that is prized for its high egg production rate and gentle disposition. According to recent studies, the mean rate of egg production for 1-year-old Golden Comets is 5.1 eggs/week.
Sarah has 35 1-year-old hens that are fed exclusively on natural scratch feed: insects, seeds, and plants that the hens obtain as they range freely around the farm. Her hens exhibit a mean egg-laying rate of 5.4 eggs/day.
Sarah wants to determine whether the mean laying rate for her hens is higher than the mean rate for all Golden Comets. Assume the population standard deviation to be
i. State the appropriate null and alternate hypotheses.
ii. Compute the value of the test statistic.
iii. State a conclusion. Use the level of significance.

Question 26

The Golden Comet is a hybrid chicken that is prized for its high egg production rate and gentle disposition. According to recent studies, the mean rate of egg production for 1-year-old Golden
Comets is 5.4 eggs/week.
Sarah has 46 1-year-old hens that are fed exclusively on natural scratch feed: insects, seeds, and
Plants that the hens obtain as they range freely around the farm. Her hens exhibit a mean egg-laying
Rate of 5.9 eggs/day.
Sarah wants to determine whether the mean laying rate for her hens is higher than the mean rate for all
Golden Comets. State the appropriate null and alternate hypotheses.

A)
B)
C)
D)

Question 27

If P=0.016, which of the following is the best conclusion?

A) If H₀ is false, the probability of obtaining a test statistic as extreme as or more extreme than the one actually observed is 0.016.
B) If H₀ is true, the probability of obtaining a test statistic as extreme as or more extreme than the one actually observed is 0.016.
C) The probability that H₀ is true is 0.016.
D) The probability that H₀ is false is 0.016 .

Question 28

A test of H₀: =59 versus H₁: 59 is performed using a significance level of =0.01 . The value of the test statistic is z=-2.66.
If the true value of is 55 , does the conclusion result in a Type I error, a Type II error, or a correct decision?

A) Type I error
B) Correct decision
C) Type II error

Question 29

Mercury is a heavy metal that can cause severe health problems in even small concentrations. Fish and shellfish efficiently concentrate mercury into their flesh, so it is important to monitor seafood for its mercury
Content.
An extensive study conducted in 1980 concluded that the mean mercury level in oysters from the White Bear
Estuary was 0.021 parts per million (ppm) with a standard deviation In 2012, a
Sample of 47 oysters from the same estuary exhibited a mean mercury concentration of 0.017 ppm.
Can you conclude that the 2012 mercury concentration is lower than in 1980? Use the level of
Significance.

A) No. There is insufficient evidence to conclude that the mercury concentration has decreased from 1980 to 2012.
B) Yes. The mercury concentration appears to be lower in 2012.
C) There is not enough information to reach a conclusion.

Question 30

A test of H₀:=41 versus H₁: 41 is performed using a significance level of =0.05 . The value of the test statistic is z=-1.84. Is H0 rejected?

A) No
B) It cannot be determined.
C) Yes

Question 31

At a water bottling facility, a technician is testing a bottle filling machine that is supposed to deliver
500 milliliters of water. The technician dispenses 38 samples of water and determines the volume of
each sample. The 38 samples have a mean volume of . The machine is out of
calibration if the mean volume differs from 500 mL.
The technician wants to perform a hypothesis test to determine whether the machine is out of calibration. The
standard deviation of the dispensed volume is known to be
i). State the appropriate null and alternate hypotheses.
ii). Compute the value of the test statistic.
iii). State a conclusion. Use the level of significance.

Question 32

A test of versus is performed using a significance level of =0.01 . The value of the test statistic is z=-2.24.
If the true value of is 49 does the conclusion result in a Type I error, a Type II error, or a correct decision?

A) Type II error
B) Type I error
C) Correct decision

Question 33

A test of 45 versus is performed using a significance level of =0.01. The value of the test statistic is z=-2.24.
If the true value of is 45 , does the conclusion result in a Type I error, a Type II error, or a correct decision?

A) Type I error
B) Correct decision
C) Type II error

Question 34

A test of H₀:=55 versus H₁: 55 is performed using a significance level of :=0.05 . The P-value is 0.048 .
If the true value of : is 59 , does the conclusion result in a Type I error, a Type II error, or a correct decision?

A) Type I error
B) Type II error
C) Correct decision

Question 35

A test of H₀: =58 versus H₁: 58 is performed using a significance level of =0.05 . The value of the test statistic is z=-2.08.
If the true value of =: is 58 , does the conclusion result in a Type I error, a Type II error, or a correct decision?

A) Correct decision
B) Type II error
C) Type I error

Question 36

A) Yes
B) It cannot be determined.
C) No

Question 37

At a water bottling facility, a technician is testing a bottle filling machine that is supposed to deliver 750 milliliters of water. The technician dispenses 38 samples of water and determines the volume of
Each sample. The 38 samples have a mean volume of . The machine is out of
Calibration if the mean volume differs from 750 mL.
The technician wants to perform a hypothesis test to determine whether the machine is out of calibration. The
Standard deviation of the dispensed volume is known to be Compute the value of the test statistic.

A) 3.00
B) 1.33
C) 0.18
D) 0.22

Question 38

The Golden Comet is a hybrid chicken that is prized for its high egg production rate and gentle disposition. According to recent studies, the mean rate of egg production for 1-year-old Golden
Comets is 5.6 eggs/week.
Sarah has 41 1-year-old hens that are fed exclusively on natural scratch feed: insects, seeds, and
Plants that the hens obtain as they range freely around the farm. Her hens exhibit a mean egg-laying
Rate of 5.9 eggs/day.
Sarah wants to determine whether the mean laying rate μ for her hens is higher than the mean rate for all
Golden Comets. Assume the population standard deviation to be y. Compute the
Value of the test statistic.

A) 0.87
B) 0.18
C) 1.47
D) 1.13

Question 39

A test of H₀:=59 versus H₁: 59 is performed using a significance level of =0.01 . The P-value is 0.115.
If the true value of is 59 , does the conclusion result in a Type I error, a Type II error, or a correct decision?

A) Type II error
B) Type I error
C) Correct decision

Question 40

At a water bottling facility, a technician is testing a bottle filling machine that is supposed to deliver 1,000 milliliters of water. The technician dispenses 46 samples of water and determines the volume
Of each sample. The 46 samples have a mean volume of https://d2lvgg3v3hfg70.cloudfront.net/TB34225555/. The machine is out of
Calibration if the mean volume differs from 1,000 mL.
The technician wants to perform a hypothesis test to determine whether the machine is out of calibration.
State the appropriate null and alternate hypotheses.

A)
B)
C)
D)

Question 41

A sample of 39 students enroll in a program that claims to improve scores on the quantitative reasoning
portion of the Graduate Record Examination (GRE). The participants take a mock GRE test before the
program begins and again at the end to measure their improvement. The mean number of points improved was =7. Assume the standard deviation is =56 and let be، the population mean number of points improved. To determine whether the program is effective, a test is made of the hypotheses
i). Compute the value of the test statistic.
ii). Compute the P-value.
iii). Do you reject H0 at the level?

Question 42

A sample of 39 students enroll in a program that claims to improve scores on the quantitative reasoning portion of the Graduate Record Examination (GRE). The participants take a mock GRE test before the
Program begins and again at the end to measure their improvement. Compute the P-value.

A) 0.0305
B) 0.0076
C) 1.8735
D) 0.0153

Question 43

The following output from MINITAB presents the results of a hypothesis test.

Do you reject H₀ at the level?

A) No
B) Yes
C) There is not enough information to draw a conclusion.

Question 44

The following output from MINITAB presents the results of a hypothesis test. What is the value of the test statistic?

A) 0.002009
B) 1.359737
C) -3.088977
D) 31.26

Question 45

Forty members of a bowling league sign up for a program that claims to improve bowling scores. The participants bowl a set of five games before the program begins and a set of five games again at the end to
Measure their improvement.

A) Yes
B) There is not enough information to draw a conclusion.
C) No

Question 46

According to a survey, the mean height for men is 68.6 inches. In a sample of 320 men between the ages of 60 and 69 , the mean height was inches. Public health officials want to determine whether the mean height for older men is less than the mean height of all adult men. Assuming the population standard deviation to be inches, compute the value of the test statistic.

A) 0.74
B) 429.95
C) -0.63
D) 0.63

Question 47

Forty-three members of a bowling league sign up for a program that claims to improve bowling scores. The participants bowl a set of five games before the program begins and a set of five games again at
The end to measure their improvement. Using technology, compute the P-value.

A) 0.0994
B) 0.1987
C) 0.0497
D) 0.8461

Question 48

The following display from a TI-84 Plus calculator presents the results of a hypothesis test. What is the value of the test statistic?

A) -2.527972
B) 1.988528
C) 60
D) 57.40

Question 49

The following display from a TI-84 Plus calculator presents the results of a hypothesis test. What is the P-value?

A) 54.89
B) 1.803583
C) 56
D) -1.291829

Question 50

Forty-three members of a bowling league sign up for a program that claims to improve bowling scores. The participants bowl a set of five games before the program begins and a set of five games again at
The end to measure their improvement. Compute the P-value.

A) 0.0198
B) 0.0395
C) 0.0099
D) 1.7565

Question 51

The following display from a TI-84 Plus calculator presents the results of a hypothesis test. What are the null and alternate hypotheses?

A)
B)
C)
D)

Question 52

The following output from MINITAB presents the results of a hypothesis test. What is the P-value?

A) 1.968656
B) 0.014319
C) 46.10
D) 2.449164

Question 53

The following output from MINITAB presents the results of a hypothesis test. What are the null and alternate hypotheses?

A)
B)
C)
D)

Question 54

A) Yes
B) There is not enough information to draw a conclusion.
C) No

Question 55

Forty-six members of a bowling league sign up for a program that claims to improve bowling scores. The participants bowl a set of five games before the program begins and a set of five games again at the end to
Measure their improvement. Compute the value of the test statistic.

A) 1.61
B) 12.36
C) 0.24
D) 0.0537

Question 56

A sample of 43 students enroll in a program that claims to improve scores on the quantitative reasoning portion of the Graduate Record Examination (GRE). The participants take a mock GRE test before the
Program begins and again at the end to measure their improvement. Using technology, compute the P-value.

A) 0.039993052
B) 1.405165398
C) 0.019996526
D) 0.079986104

Question 57

A sample of 46 students enroll in a program that claims to improve scores on the quantitative reasoning portion of the Graduate Record Examination (GRE). The participants take a mock GRE test before the
Program begins and again at the end to measure their improvement.
The mean number of points improved was Assume the standard deviation is and let be
The population mean number of points improved. To determine whether the program is effective, a
Test is made of the hypotheses versus Compute the value of the test statistic.

A) 0.28
B) 0.0307
C) 1.87
D) 11.80

Question 58

Forty-three members of a bowling league sign up for a program that claims to improve bowling scores. The participants bowl a set of five games before the program begins and a set of five games again at the end to measure their improvement. The mean number of points improved (over the set of five games) was Assume the standard deviation is and let \mu be the population mean number of points improved for the set of five games. To determine whether the program is effective, a test is made of the hypotheses versus
i). Compute the value of the test statistic.
ii). Compute the P-value.
iii). Do you reject H₀ at the =0.01 level?

Question 59

A sample of 36 students enroll in a program that claims to improve scores on the quantitative reasoning portion of the Graduate Record Examination (GRE). The participants take a mock GRE test before the
Program begins and again at the end to measure their improvement.

A) No
B) There is not enough information to draw a conclusion.
C) Yes

Question 60

According to a survey, the mean height for men is 68.9 inches. In a sample of 320 men between the ages of 60 and 69 , the mean height was inches. Public health officials want to determine whether the mean height for older men is less than the mean height of all adult men. Assuming the population standard deviation to be inches, compute the P-value.

A) 0.0287
B) -1.9030
C) 0.0574
D) 0.9713

Question 61

Find the P-value for the given test statistic t, sample size n, and alternate hypothesis H₁. t=13.989, n=3,

A) 0.0025
B) 0.005
C) 0.002
D) 0.001

Question 62

A) 0.25 < P < 0.4
B) 0.05 < P < 0.1
C) 0.025 < P < 0.05
D) 0.01 < P < 0.025

Question 63

A) 0.1355
B) 0.1398
C) 0.2710
D) 0.2796

Question 64

A market research firm reported that the mean annual earnings of all family practitioners in the United States was $180,612. A random sample of 56 family practitioners in New York that month had mean earnings of =$190,854 with a standard deviation of $41,847. You wish to test whether family practitioners in New York make more than the national average.
State the null and alternate hypotheses.

A)
B)
C)
D)

Question 65

A market research firm reported that the mean annual earnings of all family practitioners in the United States was $179,574. A random sample of 38 family practitioners in New York that month
Had mean earnings of with a standard deviation of $35,113. You wish to test whether Family practitioners in New York make more than the national average. State a conclusion regarding H₀. Use the level of significance.

A) Do not reject H₀: there is insufficient evidence to conclude that the mean annual earnings are greater than the national average.
B) Reject H₀ : the mean annual earnings appear to be greater than the national average.
C) There is not enough information to draw a conclusion.

Question 66

The following prices, in dollars, of 7.5-cubic-foot refrigerators were recorded from a random sample. A consumer organization reports that the mean price of 7.5-cubic-foot refrigerators is greater than $300. Do the data provide convincing evidence of this claim? Use the level of significance and assume the
Population is normally distributed.

A) Reject . There is sufficient evidence to conclude that the mean price is greater than $300
B) Do not reject
There is not sufficient evidence to conclude that the mean price is greater than $300
C) There is not enough information to draw a conclusion.

Question 67

In a study to determine whether counseling could help people lose weight, a sample of people experienced a group-based behavioral intervention, which involved weekly meetings with a trained interventionist for a
Period of six months. The following data are numbers of pounds lost for 14 people. The following is a boxplot for these data. Is it reasonable to assume that the conditions for performing a
Hypothesis test are satisfied?

A) Yes
B) No

Question 68

A psychologist is designing an experiment in which rats will navigate a maze. Ten rats run the maze, and the time it takes for each to complete the maze is recorded. The results are as follows: Following is a boxplot for the data. Is it reasonable to assume the conditions for performing a hypothesis test
Are satisfied?

A) Yes
B) No

Question 69

A) -1.771, 1.771
B) -1.761, 1.761
C) -1.282, 1.282
D) -1.350, 1.350

Question 70

The mean annual tuition and fees for a sample of 8 private colleges was $33,700 with a standard deviation of $5,800. A dotplot shows that it is reasonable to assume that the population is
Approximately normal. You wish to test whether the mean tuition and fees for private colleges is
Different from $37,400.
Compute the value of the test statistic and state the number of degrees of freedom.

A) -1.804; 7 degrees of freedom
B) -1.804; 8 degrees of freedom
C) -0.638; 8 degrees of freedom
D) -0.638; 7 degrees of freedom

Question 71

A market research firm reported that the mean annual earnings of all family practitioners in the United States was $178,695. A random sample of 53 family practitioners in New York that month
Had mean earnings of with a standard deviation of $35,332. You wish to test whether
Family practitioners in New York make more than the national average.
Compute the value of the test statistic and state the number of degrees of freedom.

A) 3.785; 53 degrees of freedom
B) 0.010; 52 degrees of freedom
C) 0.010; 53 degrees of freedom
D) 3.785; 52 degrees of freedom

Question 72

A market research firm reported that the mean annual earnings of all family practitioners in the
United States was $178,011. A random sample of 38 family practitioners in New York that month
had mean earnings of with a standard deviation of $35,332. You wish to test whether
family practitioners in New York make more than the national average.
i). State the null and alternate hypotheses.
ii). Compute the value of the test statistic and state the number of degrees of freedom.
iii). State a conclusion regarding H0 . Use the =0.1 level of significance.

Question 73

In an attempt to increase business on Monday nights, a restaurant offers a free dessert with every dinner order. Before the offer, the mean number of dinner customers on Monday was 150. Following are the numbers of
Diners on a random sample of Mondays while the offer was in effect. Can you conclude that the mean number of diners increased while the offer was in effect? Use the α =
Level of significance and assume the population is normally distributed.

A) Reject . There is sufficient evidence to conclude that the mean number of diners increased
While the offer was in effect.
B) Do not reject . There is insufficient evidence to conclude that the mean number of diners
Increased while the offer was in effect.
C) There is not enough information to draw a conclusion.

Question 74

The mean annual tuition and fees for a sample of 12 private colleges was $40,500 with a standard deviation of $5,000 A dotplot shows that it is reasonable to assume that the population is
Approximately normal. You wish to test whether the mean tuition and fees for private colleges is
Different from $37,400. State a conclusion regarding H₀ . Use the level of significance.

A) There is not enough information to draw a conclusion.
B) Reject H₀. The mean annual tuition and fees appears to be different from $37,400.
C) Do not reject H₀.

Question 75

A) -1.895
B) -2.447
C) -1.943
D) -1.645

Question 76

A) 0.2314
B) 0.1157
C) 0.2300
D) 0.1150

Question 77

A machine that fills beverage cans is supposed to put 12 ounces of beverage in each can. The amounts measured in a simple random sample of eight cans are: The following is a dotplot for these data. Is it reasonable to assume the conditions for performing a hypothesis
Test are satisfied?

A) No
B) Yes

Question 78

Following are outstanding credit card balances for a sample of 16 college seniors at a large university. The dotplot of this data is below. Is it reasonable to assume that the conditions for performing a hypothesis test are satisfied?

A) Yes
B) No

Question 79

The mean annual tuition and fees for a sample of 15 private colleges was $41,200 with a standard deviation of $5,300. A dotplot shows that it is reasonable to assume that the population is
Approximately normal. You wish to test whether the mean tuition and fees for private colleges is
Different from $38,000.
State the null and alternate hypotheses.

A)
B)
C)
D)

Question 80

The mean annual tuition and fees for a sample of 11 private colleges was $26,500 with a standard
deviation of $6,000. A dotplot shows that it is reasonable to assume that the population is
approximately normal. You wish to test whether the mean tuition and fees for private colleges is
different from $31,000.
i). State the null and alternate hypotheses.
ii). Compute the value of the test statistic and state the number of degrees of freedom.
iii). State a conclusion regarding H0. Use the =0.05 level of significance.