Question 1

There is always a possibility that the decision reached in a hypothesis test is incorrect.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is directly addressed by the null hypothesis?

Accepted Answer

A) the population before treatment. 
B) the population after treatment. 
C) the sample before treatment. 
D) the sample after treatment. 
A) the population before treatment. 
B) the population after treatment. 
C) the sample before treatment. 
D) the sample after treatment.

Question 3

Which of the following accurately describes a hypothesis test?

Accepted Answer

A) a descriptive technique that allows researchers to describe a sample 
B) a descriptive technique that allows researchers to describe a population 
C) an inferential technique that uses the data from a sample to draw inferences about a population 
D) an inferential technique that uses information about a population to make predictions about a sample 
A) a descriptive technique that allows researchers to describe a sample 
B) a descriptive technique that allows researchers to describe a population 
C) an inferential technique that uses the data from a sample to draw inferences about a population 
D) an inferential technique that uses information about a population to make predictions about a sample

Question 4

What is measured by the denominator of the z-score test statistic?

Accepted Answer

A) the average distance between M and µ that would be expected if H0 was true 
B) the actual distance between M and µ 
C) the position of the sample mean relative to the critical region 
D) whether or not there is a significant difference between M and µ 
A) the average distance between M and µ that would be expected if H0 was true 
B) the actual distance between M and µ 
C) the position of the sample mean relative to the critical region 
D) whether or not there is a significant difference between M and µ

Question 5

If a treatment has a very small effect, then what is a likely outcome for a hypothesis test evaluating the treatment?

Accepted Answer

A) a Type I error 
B) a Type II error 
C) correctly reject the null hypothesis 
D) correctly fail to reject the null hypothesis 
A) a Type I error 
B) a Type II error 
C) correctly reject the null hypothesis 
D) correctly fail to reject the null hypothesis

Question 6

If the power for a hypothesis test is calculated to be 0.80, then for same test, the probability of a Type II error is 0.20.

Accepted Answer

A) True 
 B)False

Question 7

If α is held constant at .05, what is the relationship between sample size, the critical region, and the risk of a Type I error?

Accepted Answer

A) As sample size increases, the critical region expands and the risk of a Type I error increases. 
B) As sample size increases, the critical region shrinks and the risk of a Type I error increases. 
C) As sample size increases, the critical region expands and the risk of a Type I error decreases. 
D) There is no relationship between sample size, the critical region, and the risk of a Type I error. 
A) As sample size increases, the critical region expands and the risk of a Type I error increases. 
B) As sample size increases, the critical region shrinks and the risk of a Type I error increases. 
C) As sample size increases, the critical region expands and the risk of a Type I error decreases. 
D) There is no relationship between sample size, the critical region, and the risk of a Type I error.

Question 8

A researcher expects a treatment to produce an increase in the population mean.The treatment is evaluated using a one tailed hypothesis test, and the test produces z = +1.85.Based on this result, what is the correct statistical decision?

Accepted Answer

A) The researcher should reject the null hypothesis with α = .05 but not with α = .01. 
B) The researcher should reject the null hypothesis with either α = .05 or α = .01. 
C) The researcher should fail to reject H0 with either α = .05 or α = .01. 
D) cannot answer without additional information 
A) The researcher should reject the null hypothesis with α = .05 but not with α = .01. 
B) The researcher should reject the null hypothesis with either α = .05 or α = .01. 
C) The researcher should fail to reject H0 with either α = .05 or α = .01. 
D) cannot answer without additional information

Question 9

A research report includes the statement, z = 2.13, p < .05.For this hypothesis test, the used null hypothesis is rejected using an alpha level of α = .05.

Accepted Answer

A) True 
 B)False

There is always a possibility that the decision reached in a hypothesis test is incorrect.

Which of the following is directly addressed by the null hypothesis?

Which of the following accurately describes a hypothesis test?

What is measured by the denominator of the z-score test statistic?

If a treatment has a very small effect, then what is a likely outcome for a hypothesis test evaluating the treatment?

If the power for a hypothesis test is calculated to be 0.80, then for same test, the probability of a Type II error is 0.20.

If α is held constant at .05, what is the relationship between sample size, the critical region, and the risk of a Type I error?

A researcher expects a treatment to produce an increase in the population mean.The treatment is evaluated using a one tailed hypothesis test, and the test produces z = +1.85.Based on this result, what is the correct statistical decision?

A research report includes the statement, z = 2.13, p < .05.For this hypothesis test, the used null hypothesis is rejected using an alpha level of α = .05.

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores

Probability

The Distribution of Sample Means

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

Exam 8: Introduction to Hypothesis Testing

There is always a possibility that the decision reached in a hypothesis test is incorrect.

Which of the following is directly addressed by the null hypothesis?

Which of the following accurately describes a hypothesis test?

What is measured by the denominator of the z-score test statistic?

If a treatment has a very small effect, then what is a likely outcome for a hypothesis test evaluating the treatment?

If the power for a hypothesis test is calculated to be 0.80, then for same test, the probability of a Type II error is 0.20.

If α is held constant at .05, what is the relationship between sample size, the critical region, and the risk of a Type I error?

A researcher expects a treatment to produce an increase in the population mean.The treatment is evaluated using a one tailed hypothesis test, and the test produces z = +1.85.Based on this result, what is the correct statistical decision?

A research report includes the statement, z = 2.13, p < .05.For this hypothesis test, the used null hypothesis is rejected using an alpha level of α = .05.

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores

Probability

The Distribution of Sample Means

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters