Measurement and Methodology-Statistical Procedures (GRE (Graduate Record Examinations) Psychology): Questions 20 - 20 of 20

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Question number: 20

» Measurement and Methodology » Statistical Procedures

MCQ▾

Question

A researcher wants to consider the effects of preparation on standardized test scores. She plans to compare the GRE scores of students who did and did not take a preparation course for the GRE. She also plans to compare the GRE scores of students who took preparation courses though Company X, Company Y, and Company Z.

The researchers found that students who took a preparation course with Companies X and Y scored higher on the GRE than students who did not prepare. But students who took a preparation course with Company Z scored no higher on average than students who did not take a preparation course. These results are an example of

A negative correlation

Choices

Choice (4) Response

a.

a flat effect

b.

a main effect

c.

an interaction effect

d.

a zero correlation

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