Question

A recent study found that people with insomnia are more likely to experience heart problems than people without insomnia.
a. What are the explanatory and response variables in this study?
b. Explain why amount of caffeine consumed might be a confounding variable in this study by explaining how caffeine consumption fits the two properties of confounding variables given in the box on page 93.


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  • CreatedOctober 22, 2015
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