Dr Marshall Conducted an Experiment to Test Changes in Sex

Dr. Marshall conducted an experiment to test changes in sex roles due to spending an entire day reading about the achievements of great women artists and scientists. The experimental group read fifteen articles about great women. The control group read fifteen articles about cooking, automobiles, astronomy, and accounting. During the lunch break, subjects from the experimental and control groups met and talked about what they were reading. What internal validity problem may occur?

A) experimental mortality
B) maturation
C) diffusion of treatment
D) testing

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