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 effect of intelligence on the test scores is controlled with a statistical procedure.

Question

Quizplus · Accepted Answer

Using analysis of covariance allows for controlling the variable of intelligence in the study while still examining the effect of laboratory experience on chemistry achievement test scores. This technique adjusts for the potential influence of intelligence by adding it as a covariate in the statistical analysis.

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