In experiments, which of the following would best describe the internal validity threat of "experimental attrition"?

a. Between the pretest and the posttest, political events transpire that have theeffect of changing people's attitudes regarding the dependent variable in theexperiment

b. A person who scored extremely high on a pretest IQ test does a lot worse onthe posttest.
c. Repeated exposure to the measuring device leads people to responddifferently to it each time.
d. Between the pretest and posttest, 20 percent of the experimental subjectsmove from the area where the experiment is being conducted.


d

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What will be an ideal response?

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