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