A researcher gives a new drug to 50 volunteers and later evaluates their behavior, reporting that the drug made them happier than similar people who did not volunteer. What is wrong with this study??
a. The study lacks both an independent variable and a dependent variable
b. The study has too many independent variables and not enough demand characteristics.
c. The people in the control group should have received the drug also.
d. Participants were not assigned randomly and the observer was not blind.
Ans: d. Participants were not assigned randomly and the observer was not blind.
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