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Physicians take a sample of smokers and nonsmokers and record the time it takes them...

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Biology

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Physicians take a sample of smokers and nonsmokers and record the time it takes them to fall asleep on seven consecutive nights. What is the variable of interest?A. The physiciansB. The average time it takes to fall asleep on the seven nightsC. The smokers and nonsmokersD. The amount of time it takes to fall asleep each night

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