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In attempting to study police officers' attitudes toward their supervisors, Alex surveys 25 police officers working in the day shift. In this case, what can help Alex ensure that his findings have external validity?

A. Using a larger sample of officers working in the day shift
B. Randomly assigning officers to work under specific supervisors
C. Surveying officers from all shifts in the department
D. Using confounding variables

Respuesta :

Answer:

The correct answer is D.

Explanation:

A confounding variable is a variable that you didn’t account for. It is when an experimenter cannot tell the difference between the effects of different factors on a variable. This method is used to influence the outcome of experimental design.

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