Mathematics, 18.07.2020 17:01 drea445
1. An article on CNN reports that Americans are increasingly skimping on their sleep. A researcher wants to determine if Americans are sleeping less than the recommended 7 hours a night. He takes a random sample of 150 Americans and computes the average sleep time of 6.7 hours a night. The standard deviation is known to be 2.1 hours. The level of significance is .01.
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1. An article on CNN reports that Americans are increasingly skimping on their sleep. A researcher w...
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