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K3k33_L0v3tt K3k33_L0v3tt
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6 years ago
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.
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