Which of the following statements about interpreting the results of a literature review is/are TRUE?

Question

Quizplus · Accepted Answer

All of the above statements are true. 
A) A main effect for a moderator variable in a literature review is indeed equivalent to an interaction in primary research. 
B) Reviews of studies testing the same hypothesis can indeed reach different conclusions because criteria for including studies may vary, differences in methods for combining and synthesizing studies may exist, and personal biases of the reviewer may influence interpretation of the results. 
C) Any effect found for a moderator variable is a correlational relationship, not a causal relationship. Correlational studies cannot establish causality, even in moderator analyses.

Which of the Following Statements About Interpreting the Results of a Literature