Which of the following is the purpose of using an operational definition? multiple choice establishing an operational definition ensures that everyone agrees on what a variable means. research participant bias is increased when a study uses an operational definition. internal validity becomes unnecessary when a study has an established operational definition. experimenter bias is eliminated with the use of an operational definition.

Establishing an operational definition ensures that everyone agrees on what a variable means.

Explanation:

An operational definition offers an unbiased description of the way researchers are going to measure and observe a variable in a specific study. It is a key element for the collection of all sorts of data and becomes crucial when it is necessary to judge how correct or incorrect something is, or to clear the doubts about something.

answer; (73%);

answer; when one group has an extremely high score at pretest;