An educational psychologist discovers that when one group of students is sleep-deprived, they perform worse on a test than the group of students who are allowed to sleep through the night. This is an example of:

Question

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This is an example of an experiment because the psychologist manipulates one variable (amount of sleep) to see its effect on another variable (test performance), which is a hallmark of experimental research.

An Educational Psychologist Discovers That When One Group of Students