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 uses only those students with IQs of 100-105.

Question

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The researcher is using a homogeneous group as a control technique by selecting students with IQs within a narrow range (100-105), ensuring that the variable of intelligence is consistent across participants.

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