Sleep: Suppose you perform a study about the hours of sleep that college students get. You know that for all people, the average is about 7 hours. You randomly select 50 college students and survey them on their sleep habits. From this sample, the mean number of hours of sleep is found to be 6.2 hours with a standard deviation of 0.75 hours. In the previous chapter we calculated a 99% confidence interval for the mean number of hours of sleep to college students as 5.9