Exhibit 10-3 A Statistics Teacher Wants to See If There Is Any

question 36

Multiple Choice

Exhibit 10-3
A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information.
-Refer to Exhibit 10-3. What is the conclusion that can be reached about the difference in the average final examination scores between the two classes? (Use a .05 level of significance.)

• A)There is a statistically significant difference in the average final examination scores between the two classes.
• B)There is no statistically significant difference in the average final examination scores between the two classes.
• C)It is impossible to make a decision on the basis of the information given.
• D)There is a difference, but it is not significant.

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Definitions:

Mediator Variable

A variable that explains the mechanism through which an independent variable influences a dependent variable in a causal relationship.

Predictor Variable

A variable, often designated as the independent variable, that is used to make predictions about (or is assumed to cause) changes in another variable.

Criterion Variable

The variable that is predicted or explained in a study, often considered the outcome or dependent variable.

Latent Class Analysis

A statistical method used to identify subgroups within a population that share certain characteristics, without these groups being previously known.