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In looking at our class’s data as a sample of a larger population of students (who...

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Basic Math

In looking at our class’s data as a sample of a largerpopulation of students (who have taken, are taking, or may oneday take this class), we find that the mean number of hoursexercised per week during the summer is nearly 9 hours. We knowthat this is an estimate however. Is it likely that the truepopulation mean is actually under 7 hours? Use a 95% confidenceinterval to determine this. If we’re willing to use a 99%confidence interval, does that change our findings? (Careful withyour rounding!)

. mean exersum

Meanestimation                  Number of obs  =        215

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

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

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

     exersum |  8.946512   .7143183     

Answer & Explanation Solved by verified expert
4.1 Ratings (623 Votes)
Solution First of all we have to find 95 confidence interval for population mean Confidence interval Xbar ZSE Where SE is standard error We use Z confidence interval because sample size is given as n215 which is larger as compared to n30 For 95    See Answer
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