A researcher is conducting an experiment to test the effect of feedback on job performance. The researcher can exercise control over extraneous variables, such as intelligence, by:

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By randomly assigning participants to feedback conditions, the researcher can ensure that any differences in job performance are due to the feedback and not extraneous variables such as intelligence. This helps to control for the influence of individual differences in intelligence and other factors that may affect job performance. Using participants with the same level of intelligence or job performance is limiting and does not account for individual differences in these factors that may impact the results. Giving all participants the same type of feedback also does not allow for comparisons between different feedback conditions.

A Researcher Is Conducting an Experiment to Test the Effect