Researchers must describe the actions that will be taken to measure or control each variable in their studies. In other words, they must: A. provide operational definitions of their variables. B....

Researchers must describe the actions that will be taken to measure or control each variable in their studies. In other words, they must:

A. provide operational definitions of their variables.

B. decide whether their studies will be experimental or correlational.

C. use statistics to summarize their findings.

D. decide how many subjects should participate in their studies.