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A class survey in a large class for freshmwn students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 266 students was =140.9005 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation= 62.6328 minutes in the population of all first-yearstudents at this university.
Use the survey result to give a 99% confidence interval for the mean study time of all first-year students:____±____(+-0.0001).

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140.9005+/- 2.576*62.6328/sqrt(266)=
140.9005+/-9.8925
answered by: Lela
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