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 selects a student from the lab condition who has the same IQ score as a non-lab student and continues this process to identify as many pairs as possible.

Question

Quizplus · Accepted Answer

The procedure described is matching, which is a technique used to control for the effects of a specific variable, in this case intelligence. By creating pairs of students with similar IQ scores, the researcher can compare their chemistry achievement scores more fairly, since intelligence is no longer a confounding variable. Option B (using analysis of covariance) and option D (adding intelligence as an additional independent variable) are also ways to control for intelligence, but they are not mentioned in the given scenario. Option C (using a homogeneous group) is not relevant to the situation, as the researcher already has two distinct groups to compare.

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