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A researcher runs an experiment to test the effect of a new drug designed to treat anxiety. The researcher gives one group of people the drug and a different group of people a placebo drug (sugar pill). Then the researcher measured, for each group, the amount of anxiety in each person. In this example, the independent variable is , while the dependent variable is .

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A researcher runs an experiment to test the effect of a new drug designed to treat anxiety. The rese...

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