Mathematics, 22.04.2020 00:20 howell62

A researcher wants to examine the effect of caffeine on sleep. She splits participants into two groups. The first group drinks caffeinated-coffee at 8pm and the second group drinks decaf-coffee at 8pm. The researcher records what time participants fall asleep. What is the independent variable

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A researcher wants to examine the effect of caffeine on sleep. She splits participants into two grou...

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