In looking at our class's data as a sample of a larger population of students (who have taken, are taking, or may one day take this class), we find that the mean number of hours exercised per week during the summer is nearly 9 hours. We know that this is an estimate however. Is it likely that the true population mean is actually under 7 hours? Use a 95% confidence interval to determine this. If we're willing to use a 99% confidence interval, does that change our findings? (Careful with your rounding!)

. mean exersum

Mean estimation Number of obs =215

--------------------------------------------------------------

| Mean Std. Err. [95% Conf. Interval]

-------------+------------------------------------------------

exersum | 8.946512 .7143183