(Solution) An article in the National Geographic News (February 24, 2005) reports that Americans are increasingly skimping on their sleep. > Snapessays.com


(Solution) An article in the National Geographic News (February 24, 2005) reports that Americans are increasingly skimping on their sleep.


An article in the National Geographic News (February 24, 2005) reports that Americans are increasingly skimping on their sleep. A researcher wants to determine if Americans are sleeping less than the recommended 7 hours of sleep on weekdays. He takes a random sample of 150 Americans and computes the average sleep time of 6.7 hours on weekdays. Assume that the population is normally distributed with a known standard deviation of 2.1 hours.a)Calculate the critical value at Î± = 0.01. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.)

 


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This question was answered on: Sep 21, 2023

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