Question 1

What type of error occurs if you fail to reject H0 when, in fact, it is not true?

Accepted Answer

A)  Type II 
B)  Type I 
C)  either Type I or Type II, depending on the level of significance 
D)  either Type I or Type II, depending on whether the test is one-tailed or two-tailed 
A)  Type II 
B)  Type I 
C)  either Type I or Type II, depending on the level of significance 
D)  either Type I or Type II, depending on whether the test is one-tailed or two-tailed

Question 2

The p-value is

Accepted Answer

A)  the same as the z statistic. 
B)  a sample statistic. 
C)  a distance. 
D)  a probability. 
A)  the same as the z statistic. 
B)  a sample statistic. 
C)  a distance. 
D)  a probability.

Question 3

Read the z statistic from the normal distribution table and choose the correct answer. For a two-tailed test using α = .0802, z =

Accepted Answer

A)  .85. 
B)  1.75. 
C)  1.405. 
D)  .2.88. 
A)  .85. 
B)  1.75. 
C)  1.405. 
D)  .2.88.

Question 4

Read the t statistic from the t distribution table and choose the correct answer. For a one-tailed test (upper tail), using a sample size of 14, and at the 5% level of significance, t =

Accepted Answer

A)  1.761. 
B)  -1.761. 
C)  -1.771. 
D)  1.771. 
A)  1.761. 
B)  -1.761. 
C)  -1.771. 
D)  1.771.

Question 5

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

Accepted Answer

A)  will always be rejected 
B)  will always not be rejected 
C)  will never be tested 
D)  may be rejected or not rejected 
A)  will always be rejected 
B)  will always not be rejected 
C)  will never be tested 
D)  may be rejected or not rejected

Question 6

In a one-tailed hypothesis test (lower tail), the test statistic is determined to be 2. The p-value for this test is

Accepted Answer

A)  .9772. 
B)  .0228. 
C)  .0056. 
D)  .5228. 
A)  .9772. 
B)  .0228. 
C)  .0056. 
D)  .5228.

Question 7

When the area corresponding to the critical value is in the lower tail of the sampling distribution, the p-value is the area under the curve​

Accepted Answer

A)  ​less than or equal to the critical value. 
B)  ​less than or equal to the test statistic. 
C)  ​greater than or equal to the critical value. 
D)  ​greater than or equal to the test statistic. 
A)  ​less than or equal to the critical value. 
B)  ​less than or equal to the test statistic. 
C)  ​greater than or equal to the critical value. 
D)  ​greater than or equal to the test statistic.

Question 8

A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether the proportion of the population in favor of Candidate A is significantly more than 75%. The test statistic is

Accepted Answer

A)  .8. 
B)  .75. 
C)  1.15. 
D)  -1.25. 
A)  .8. 
B)  .75. 
C)  1.15. 
D)  -1.25.

Question 9

The manager of a laptop computer dealership is considering a new bonus plan in order to increase sales. Currently, the mean sales rate per salesperson is five laptops per week. The correct set of hypotheses for testing the effect of the bonus plan is

Accepted Answer

A) H0: μ a: μ ≥ 5. B) H0: μ 5 Ha: μ > 5. C) H0: μ > 5 Ha: μ 5. D) H0: μ 5 Ha: μ < 5. A) H0: μ a: μ ≥ 5. B) H0: μ 5 Ha: μ > 5. C) H0: μ > 5 Ha: μ 5. D) H0: μ 5 Ha: μ < 5.

Question 10

A random sample of 100 people was taken. Eighty-five of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. At the .05 level of significance, it can be concluded that the proportion of the population in favor of candidate A is

Accepted Answer

A)  significantly greater than 80%. 
B)  not significantly greater than 80%. 
C)  significantly greater than 85%. 
D)  not significantly greater than 85%. 
A)  significantly greater than 80%. 
B)  not significantly greater than 80%. 
C)  significantly greater than 85%. 
D)  not significantly greater than 85%.

Question 11

The p-value is a probability that measures the support (or lack of support) for

Accepted Answer

A)  the null hypothesis. 
B)  the alternative hypothesis. 
C)  either the null or the alternative hypothesis. 
D)  neither the null nor the alternative hypothesis. 
A)  the null hypothesis. 
B)  the alternative hypothesis. 
C)  either the null or the alternative hypothesis. 
D)  neither the null nor the alternative hypothesis.

Question 12

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

Accepted Answer

A)  p-value   α. 
B)  α < p-value. 
C)  p-value = 1 - α/2. 
D)  p-value = 1 - α. 
A)  p-value   α. 
B)  α < p-value. 
C)  p-value = 1 - α/2. 
D)  p-value = 1 - α.

Question 13

The practice of concluding "do not reject H0" is preferred over "accept H0" when we​

Accepted Answer

A)  ​are conducting a one-tailed test. 
B)  ​are testing the validity of a claim. 
C)  ​have an insufficient sample size. 
D)  ​have not controlled for the Type II error. 
A)  ​are conducting a one-tailed test. 
B)  ​are testing the validity of a claim. 
C)  ​have an insufficient sample size. 
D)  ​have not controlled for the Type II error.

Question 14

The level of significance, in hypothesis testing, is the probability of _____ null hypothesis.

Accepted Answer

A)  accepting a true 
B)  accepting a false 
C)  rejecting a true 
D)  rejecting a false 
A)  accepting a true 
B)  accepting a false 
C)  rejecting a true 
D)  rejecting a false

Question 15

The critical value of t for a two-tailed test with 10 degrees of freedom using α = .05 is

Accepted Answer

A)  1.833. 
B)  1.812. 
C)  2.262. 
D)  2.228. 
A)  1.833. 
B)  1.812. 
C)  2.262. 
D)  2.228.

Question 16

If the null hypothesis is rejected in hypothesis testing,

Accepted Answer

A)  no conclusions can be drawn from the test. 
B)  the alternative hypothesis is true. 
C)  the data must have been accumulated incorrectly. 
D)  the sample size has been too small. 
A)  no conclusions can be drawn from the test. 
B)  the alternative hypothesis is true. 
C)  the data must have been accumulated incorrectly. 
D)  the sample size has been too small.

Question 17

The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is

Accepted Answer

A)  H0: p a: p   .35. 
B)  H0: p   .35 Ha: p > .35. 
C)  H0: p   .35 Ha: p 0: p > .35 Ha: p   .35. 
A)  H0: p a: p   .35. 
B)  H0: p   .35 Ha: p > .35. 
C)  H0: p   .35 Ha: p 0: p > .35 Ha: p   .35.

Question 18

For a lower tail hypothesis test with a sample size of 13 and a .10 level of significance, the critical value of the test statistic t is

Accepted Answer

A)  -1.356. 
B)  -1.350. 
C)  -1.782 
D)  -1.771. 
A)  -1.356. 
B)  -1.350. 
C)  -1.782 
D)  -1.771.

Question 19

The average hourly wage of computer programmers with 2 years of experience has been $21.80. Because of high demand for computer programmers, it is believed there has been a significant increase in the average hourly wage of computer programmers. To test whether or not there has been an increase, the correct hypotheses to be tested are

Accepted Answer

A)  H0: μ a: μ ≥ 21.80. 
B)  H0: μ = 21.80 Ha: μ ≠ 21.80. 
C)  H0: μ > 21.80 Ha: μ ≤ 21.80. 
D)  H0: μ ≤ 21.80 Ha: μ > 21.80. 
A)  H0: μ a: μ ≥ 21.80. 
B)  H0: μ = 21.80 Ha: μ ≠ 21.80. 
C)  H0: μ > 21.80 Ha: μ ≤ 21.80. 
D)  H0: μ ≤ 21.80 Ha: μ > 21.80.

Question 20

The power curve provides the probability of

Accepted Answer

A)  correctly accepting the null hypothesis. 
B)  incorrectly accepting the null hypothesis. 
C)  incorrectly rejecting the null hypothesis. 
D)  correctly rejecting the null hypothesis. 
A)  correctly accepting the null hypothesis. 
B)  incorrectly accepting the null hypothesis. 
C)  incorrectly rejecting the null hypothesis. 
D)  correctly rejecting the null hypothesis.

What type of error occurs if you fail to reject H₀ when, in fact, it is not true?

The p-value is

Read the z statistic from the normal distribution table and choose the correct answer. For a two-tailed test using α = .0802, z =

Read the t statistic from the t distribution table and choose the correct answer. For a one-tailed test (upper tail), using a sample size of 14, and at the 5% level of significance, t =

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

In a one-tailed hypothesis test (lower tail), the test statistic is determined to be 2. The p-value for this test is

When the area corresponding to the critical value is in the lower tail of the sampling distribution, the p-value is the area under the curve

A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether the proportion of the population in favor of Candidate A is significantly more than 75%. The test statistic is

The manager of a laptop computer dealership is considering a new bonus plan in order to increase sales. Currently, the mean sales rate per salesperson is five laptops per week. The correct set of hypotheses for testing the effect of the bonus plan is

The p-value is a probability that measures the support (or lack of support) for

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

The practice of concluding "do not reject H₀" is preferred over "accept H₀" when we

The level of significance, in hypothesis testing, is the probability of _____ null hypothesis.

The critical value of t for a two-tailed test with 10 degrees of freedom using α = .05 is

If the null hypothesis is rejected in hypothesis testing,

The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is

For a lower tail hypothesis test with a sample size of 13 and a .10 level of significance, the critical value of the test statistic t is

The power curve provides the probability of

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Decision Analysis

Index Numbers

Statistical Methods for Quality Control

Sample Survey

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Exam 9: Hypothesis Tests

What type of error occurs if you fail to reject H0 when, in fact, it is not true?

The p-value is

Read the z statistic from the normal distribution table and choose the correct answer. For a two-tailed test using α = .0802, z =

Read the t statistic from the t distribution table and choose the correct answer. For a one-tailed test (upper tail), using a sample size of 14, and at the 5% level of significance, t =

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

In a one-tailed hypothesis test (lower tail), the test statistic is determined to be 2. The p-value for this test is

When the area corresponding to the critical value is in the lower tail of the sampling distribution, the p-value is the area under the curve​

A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether the proportion of the population in favor of Candidate A is significantly more than 75%. The test statistic is

The manager of a laptop computer dealership is considering a new bonus plan in order to increase sales. Currently, the mean sales rate per salesperson is five laptops per week. The correct set of hypotheses for testing the effect of the bonus plan is

The p-value is a probability that measures the support (or lack of support) for

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

The practice of concluding "do not reject H0" is preferred over "accept H0" when we​

The level of significance, in hypothesis testing, is the probability of _____ null hypothesis.

The critical value of t for a two-tailed test with 10 degrees of freedom using α = .05 is

If the null hypothesis is rejected in hypothesis testing,

The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is

For a lower tail hypothesis test with a sample size of 13 and a .10 level of significance, the critical value of the test statistic t is

The power curve provides the probability of

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Decision Analysis

Index Numbers

Statistical Methods for Quality Control

Sample Survey

Filters

What type of error occurs if you fail to reject H₀ when, in fact, it is not true?

When the area corresponding to the critical value is in the lower tail of the sampling distribution, the p-value is the area under the curve

The practice of concluding "do not reject H₀" is preferred over "accept H₀" when we