A Graduate Student Decides to Study the Effects of Fatigue

A graduate student decides to study the effects of fatigue on mood.She recruits 24 college students and subjects them all to 24 hours of sleep deprivation.At the end of the deprivation time,she asks the students to fill out a mood survey.What is CRITICALLY wrong with this experiment?

A) She used only college students.
B) She did not include a control group.
C) Her research is unethical.
D) She does not have a dependent variable.

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