Question 1

In hypothesis testing,we cannot prove a null hypothesis is true.

Accepted Answer

A) True 
 B)False

Question 2

In a statistical test,we

Accepted Answer

A) try to reject the null hypothesis. 
B) try to prove the alternative hypothesis. 
C) choose a null hypothesis that is easy to reject. 
D) choose a large level of significance if possible. 
A) try to reject the null hypothesis. 
B) try to prove the alternative hypothesis. 
C) choose a null hypothesis that is easy to reject. 
D) choose a large level of significance if possible.

Question 3

A hypothesis test may be statistically significant,yet have little practical importance.

Accepted Answer

A) True 
 B)False

Question 4

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds.Find the test statistic to decide whether the mean transaction time exceeds 60 seconds.

Accepted Answer

A) 1.457 
B) 2.037 
C) 2.333 
D) 1.848 
A) 1.457 
B) 2.037 
C) 2.333 
D) 1.848

Question 5

The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it.A trial sample of 25 employees shows that 16 are dissatisfied.For a right-tailed test,the test statistic would be

Accepted Answer

A) 1.227 
B) 1.375 
C) 1.400 
D) 1.115 
A) 1.227 
B) 1.375 
C) 1.400 
D) 1.115

Question 6

At α = .05,the critical value to test the hypotheses H0: π ≥ .40,H1: π < .40 would be

Accepted Answer

A) −1.645 
B) −1.960 
C) −2.326 
D) impossible to determine without more information. 
A) −1.645 
B) −1.960 
C) −2.326 
D) impossible to determine without more information.

Question 7

In the hypothesis H0: μ = μ0,the value of μ0 is not derived from

Accepted Answer

A) the sample. 
B) past experience. 
C) a target or benchmark. 
D) a scientific theory. 
A) the sample. 
B) past experience. 
C) a target or benchmark. 
D) a scientific theory.

Question 8

A Type I error can only occur if you reject H0.

Accepted Answer

A) True 
 B)False

Question 9

Higher power in a hypothesis test for one sample mean is likely to be associated with

Accepted Answer

A) larger n. 
B) smaller α. 
C) larger σ. 
A) larger n. 
B) smaller α. 
C) larger σ.

Question 10

The critical value in a hypothesis test

Accepted Answer

A) is calculated from the sample data. 
B) usually is .05 or .01 in most statistical tests. 
C) separates the acceptance and rejection regions. 
D) depends on the value of the test statistic. 
A) is calculated from the sample data. 
B) usually is .05 or .01 in most statistical tests. 
C) separates the acceptance and rejection regions. 
D) depends on the value of the test statistic.

Question 11

Which of the following is not a characteristic of the t distribution?

Accepted Answer

A) It is a continuous distribution. 
B) It has a mean of zero. 
C) It a symmetric distribution. 
D) It is similar to the z distribution when n is small. 
A) It is a continuous distribution. 
B) It has a mean of zero. 
C) It a symmetric distribution. 
D) It is similar to the z distribution when n is small.

Question 12

For a right-tailed test of a hypothesis for a single population mean with n = 10,the value of the test statistic was t = 1.411.The p-value is

Accepted Answer

A) between .05 and .025. 
B) between .10 and .05. 
C) greater than .10. 
D) less than .001. 
A) between .05 and .025. 
B) between .10 and .05. 
C) greater than .10. 
D) less than .001.

Question 13

A Type II error can only occur when you fail to reject H0.

Accepted Answer

A) True 
 B)False

Question 14

In a two-tailed test,a statistician got a z test statistic of 1.47.What is the p-value?

Accepted Answer

A) .0708 
B) .1416 
C) .0874 
D) .0301 
A) .0708 
B) .1416 
C) .0874 
D) .0301

Question 15

John rejected his null hypothesis in a right-tailed test for a mean at α = .025 because his critical t value was 2.000 and his calculated t value was 2.345.We can be sure that

Accepted Answer

A) John did not commit a Type I error. 
B) John did not commit a Type II error. 
C) John committed neither a Type I nor Type II error. 
D) John committed both a Type I and a Type II error. 
A) John did not commit a Type I error. 
B) John did not commit a Type II error. 
C) John committed neither a Type I nor Type II error. 
D) John committed both a Type I and a Type II error.

In hypothesis testing,we cannot prove a null hypothesis is true.

In a statistical test,we

A hypothesis test may be statistically significant,yet have little practical importance.

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds.Find the test statistic to decide whether the mean transaction time exceeds 60 seconds.

The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it.A trial sample of 25 employees shows that 16 are dissatisfied.For a right-tailed test,the test statistic would be

At α = .05,the critical value to test the hypotheses H0: π ≥ .40,H1: π < .40 would be

In the hypothesis H0: μ = μ0,the value of μ0 is not derived from

A Type I error can only occur if you reject H0.

Higher power in a hypothesis test for one sample mean is likely to be associated with

The critical value in a hypothesis test

Which of the following is not a characteristic of the t distribution?

For a right-tailed test of a hypothesis for a single population mean with n = 10,the value of the test statistic was t = 1.411.The p-value is

A Type II error can only occur when you fail to reject H0.

In a two-tailed test,a statistician got a z test statistic of 1.47.What is the p-value?

John rejected his null hypothesis in a right-tailed test for a mean at α = .025 because his critical t value was 2.000 and his calculated t value was 2.345.We can be sure that

Overview of Statistics

Data Collection

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Chi-Square Tests

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Exam 9: One-Sample Hypothesis Tests

In hypothesis testing,we cannot prove a null hypothesis is true.

In a statistical test,we

A hypothesis test may be statistically significant,yet have little practical importance.

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds.Find the test statistic to decide whether the mean transaction time exceeds 60 seconds.

The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it.A trial sample of 25 employees shows that 16 are dissatisfied.For a right-tailed test,the test statistic would be

At α = .05,the critical value to test the hypotheses H0: π ≥ .40,H1: π < .40 would be

In the hypothesis H0: μ = μ0,the value of μ0 is not derived from

A Type I error can only occur if you reject H0.

Higher power in a hypothesis test for one sample mean is likely to be associated with

The critical value in a hypothesis test

Which of the following is not a characteristic of the t distribution?

For a right-tailed test of a hypothesis for a single population mean with n = 10,the value of the test statistic was t = 1.411.The p-value is

A Type II error can only occur when you fail to reject H0.

In a two-tailed test,a statistician got a z test statistic of 1.47.What is the p-value?

John rejected his null hypothesis in a right-tailed test for a mean at α = .025 because his critical t value was 2.000 and his calculated t value was 2.345.We can be sure that

Overview of Statistics

Data Collection

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Chi-Square Tests

Filters