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what is the purpose of using multiple control groups in an experiment? a. to provide more work so that you look busy when doing experiments b. to ensure that no experimental subjects escape the maze c. to help you identify the substance that you spilled on the floor d. to help you determine that your experimental results are valid

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d. to help you determine that your experimental results are valid
To help you conclude that no uncontrolled factors significantly influenced your results.

To help you determine that your experimental results are valid

To help control for factors that aren't being tested but might affect results