Ashlee is a researcher interested in whether boys or girls grow more as a result of eating high-protein breakfast cereal. She has a control group from St. Thomas Academy in Boston that eats regular cereal, and an experimental group from an all-girls school in Witchita that eats a high protein cereal. She then measures the growth of each group at three month intervals. Although Ashlee manipulates variables in her study, it is not a true experiment because it lacks ________.
A. a dependent variable
B. a research question
C. random assignment to groups
D. Naturalistic observation
Answer: C. random assignment to groups
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A) preoperational B) sensorimotor C) concrete operational D) formal operational
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