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If a research question focused on whether students who got at least 7 hours of sleep the night before a big exam did better on

If a research question focused on whether students who got at least 7 hours of sleep the night before a big exam did better on that exam than students who got less than 7 hours of sleep the night before, what would be the independent variable and what would be the dependent variable in an experiment to test this hypothesis? Explain your answer.

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