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The national collegiate athletic association reported that the mean number of hours spent per week on...

The national collegiate athletic association reported that the mean number of hours spent per week on coaching and recruiting by college football assistant coaches during the season was 45 hours. A random sample of 40 assistant coaches showed the sample mean to be 42 hours, with a standard deviation of 7.2

a. Using the sample data, construct a 99 percent confidence interval for the population mean. (round to four decimal places as needed)

b. what is the margin of error?
(round to four decimal places as needed)

Math   Statistics-And-Probability   
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