Measurement and MethodologyStatistical Procedures (GRE (Graduate Record Examinations) Psychology): Questions 1  3 of 20
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Question number: 1
» Measurement and Methodology » Statistical Procedures
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
Choices
Choice (4)  Response  

a.  a zero correlation 

b.  an interaction effect 

c.  a flat effect 

d.  a main effect 

Question number: 2
» Measurement and Methodology » Statistical Procedures
Question
Statistics are used in psychological research to ________.
Choices
Choice (4)  Response  

a.  Justify the experimenter’s conclusions. 

b.  Evaluate the likelihood that the experiment caused the differences in behavior across treatment conditions. 

c.  Prove the null hypothesis. 

d.  Prove that the research hypothesis is correct. 

Question number: 3
» Measurement and Methodology » Statistical Procedures
Question
The amount of variance in scores accounted for by a correlation coefficient of . 70 is
Choices
Choice (4)  Response  

a.  14 % if the reliability of the measures is greater than. 70 

b.  less than zero because the correlation is negative 

c.  indeterminate because the correlation is negative 

d.  almost 50 % if the reliability of the measures is + 1.00 
