A psychologist is trying to determine how many hours the average person sleeps each night. He takes a random sample of 25 individuals and asks each person how many hours he or she slept the previous night. The sum of the observations and the sum of the squared observations are 
192.5 and 
1531.7. Estimate with 99% confidence the mean number of hours of sleep.
Correct Answer:
Verified
= 7.74 0.666. Thus, LCL = 7....View Answer
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