Which of the following is an example of an individual differences (subject) variable?
A) individuals randomly assigned to one of three different treatments in a diabetes study
B) an independent variable involving three levels of nicotine in a smoking cessation program
C) a law enforcement training program compared over a 4-week or an 8-week period
D) individuals classified as introverted or extraverted in a study of alcohol use
Correct Answer:
Verified
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