Exhibit 12-5: A researcher obtains chemistry achievement test scores from a group of high school students who have had laboratory experience and a group who have not.She recognizes the need to control for the variable intelligence in his study.Identify the type of control technique illustrated by the following procedures.
-Refer to Exhibit 12-5.The researcher enters the IQ scores into her analysis to determine both main and interaction effects of IQ and lab experiences.

Question

Quizplus · Accepted Answer

Adding intelligence as an additional independent variable allows the researcher to examine its main and interaction effects with lab experience on chemistry achievement scores.

Exhibit 12-5: a Researcher Obtains Chemistry Achievement Test Scores from a Group