A psychologist measures the IQs of 20 students who ingested a "smart pill" and 20 students who ingested a "sugar pill" in order to determine if the pill had an effect on intelligence.To ensure peak performance,she tests all of the students on Wednesdays.In this experiment,the independent variable is the

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The independent variable in this experiment is the type of pill (smart or sugar) that the students ingested. The psychologist wants to see if this independent variable has an effect on the students' IQ scores, which is the dependent variable. The day of the week and the sex of the researcher are not relevant to the experiment and do not affect the outcome.

A Psychologist Measures the IQs of 20 Students Who Ingested