Question

At the start of an experiment everyone is excited about their participation. Everyone takes a great deal of care in completing the pretest survey. The experiment takes five hours to complete. At the end of the experiment, a post-test questionnaire is administered. Many of the respondents just want to get home, and so give only superficial answers to the post-test questions. This situation reflects a ________ threat to internal validity.
A) maturation
B) selection
C) mortality
D) testing
E) researcher bias

Answer

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