Question 1

How can statistical power be increased?

Accepted Answer

A)  Increase the population variance 
B)  Increase the sample size 
C)  Increase Type I error protection (e.g., change α from .10 to .05) 
D)  Increase the value of the standard error 
A)  Increase the population variance 
B)  Increase the sample size 
C)  Increase Type I error protection (e.g., change α from .10 to .05) 
D)  Increase the value of the standard error

Question 2

When a researcher fails to reject H0 when it is false, what has occurred?

Accepted Answer

A)  He made a correct decision 
B)  He made a Type I error 
C)  He made a Type II error 
D)  None of the above 
A)  He made a correct decision 
B)  He made a Type I error 
C)  He made a Type II error 
D)  None of the above

Question 3

A study was completed to determine whether a particular teaching method improved students' gymnastics abilities. The researcher was NOT interested in detecting whether the method decreased gymnastics ability. What is the smallest t-ratio that would allow rejection of the null hypothesis? (Assume 60 degrees of freedom, and use α = .05.)

Accepted Answer

A)  1.671 
B)  2.000 
C)  2.390 
D)  2.660 
A)  1.671 
B)  2.000 
C)  2.390 
D)  2.660

Question 4

How many total subjects are needed in a 2 x 2 mixed-model group design with 20 subjects in each treatment group?

Accepted Answer

A)  10 
B)  20 
C)  40 
D)  80 
A)  10 
B)  20 
C)  40 
D)  80

How can statistical power be increased?

When a researcher fails to reject H₀ when it is false, what has occurred?

How many total subjects are needed in a 2 x 2 mixed-model group design with 20 subjects in each treatment group?

Research Methods

Introduction to Measurement and Statistics

Descriptive Statistics

The Normal Curve and Standard Scores

Correlation and Regression

Introduction to Inferential Statistics

Two-Sample T-Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Factorial Anova

Multivariate Anova Manova

Advanced Statistics

Nonparametric Statistics

Filters

Exam 8: Issues in Inferential Statistics

How can statistical power be increased?

When a researcher fails to reject H0 when it is false, what has occurred?

How many total subjects are needed in a 2 x 2 mixed-model group design with 20 subjects in each treatment group?

Research Methods

Introduction to Measurement and Statistics

Descriptive Statistics

The Normal Curve and Standard Scores

Correlation and Regression

Introduction to Inferential Statistics

Two-Sample T-Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Factorial Anova

Multivariate Anova Manova

Advanced Statistics

Nonparametric Statistics

Filters

When a researcher fails to reject H₀ when it is false, what has occurred?