Wendy wants to study how easily people make friends. She assigns people to talk with a stranger for either five minutes or ten minutes, and assigns people who are more outgoing to the "five-minute" condition, and shy people to the "ten-minute" condition
Which of the following is the threat to the internal validity in this study?
a. The independent variable isn't held constant for every participant in a condition.
b. Dependent variables are not being assigned randomly.
c. She did not select from a random sample in her population.
d. Wendy did not use random assignment.
Answer: D
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