Question 1

Which of the following accurately describes the effect of increasing the alpha level?

Accepted Answer

A) Increases the standard error and has no effect on the risk of a Type I error 
B) Decreases the standard error and has no effect on the risk of a Type I error 
C) Increases the risk of a Type I error and has no effect on the standard error 
D) Decreases the risk of a Type I error and has no effect on the standard error 
A) Increases the standard error and has no effect on the risk of a Type I error 
B) Decreases the standard error and has no effect on the risk of a Type I error 
C) Increases the risk of a Type I error and has no effect on the standard error 
D) Decreases the risk of a Type I error and has no effect on the standard error

Question 2

Which of the following will increase the power of a statistical test?

Accepted Answer

A) Change α from .05 to .01 
B) Change from a one-tailed test to a two-tailed test 
C) Change the sample size from n = 25 to n = 100 
D) None of the other options will increase power. 
A) Change α from .05 to .01 
B) Change from a one-tailed test to a two-tailed test 
C) Change the sample size from n = 25 to n = 100 
D) None of the other options will increase power.

Question 3

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = -2.24,what is the correct decision?

Accepted Answer

A) Reject the null hypothesis and conclude that the treatment has no effect 
B) Reject the null hypothesis and conclude that the treatment has an effect 
C) Fail to reject the null hypothesis and conclude that the treatment has no effect 
D) Fail to reject the null hypothesis and conclude that the treatment has an effect 
A) Reject the null hypothesis and conclude that the treatment has no effect 
B) Reject the null hypothesis and conclude that the treatment has an effect 
C) Fail to reject the null hypothesis and conclude that the treatment has no effect 
D) Fail to reject the null hypothesis and conclude that the treatment has an effect

Question 4

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.27.If the researcher is using a one-tailed test,what is the correct statistical decision?

Accepted Answer

A) Reject the null hypothesis with α = .05 but not with α = .01. 
B) Reject the null hypothesis with either α = .05 or α = .01. 
C) Fail to reject the null hypothesis with either α = .05 or α = .01. 
D) Cannot answer without additional information 
A) Reject the null hypothesis with α = .05 but not with α = .01. 
B) Reject the null hypothesis with either α = .05 or α = .01. 
C) Fail to reject the null hypothesis with either α = .05 or α = .01. 
D) Cannot answer without additional information

Which of the following accurately describes the effect of increasing the alpha level?

Which of the following will increase the power of a statistical test?

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = -2.24,what is the correct decision?

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.27.If the researcher is using a one-tailed test,what is the correct statistical decision?

Introduction to Statistics.

Frequency Distributions.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: 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 and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

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Exam 8: Introduction to Hypothesis Testing.

Which of the following accurately describes the effect of increasing the alpha level?

Which of the following will increase the power of a statistical test?

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = -2.24,what is the correct decision?

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.27.If the researcher is using a one-tailed test,what is the correct statistical decision?

Introduction to Statistics.

Frequency Distributions.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: 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 and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

Filters