A random sample of 58 college students shows that average weight is 139 lbs with a Standard deviation of 20 lb. Construct a 90 percent confidence interval for the mean weight of all college students. Does the result in part (a) means that 90% of students’ weight is in the range of your CI? If you want to be 99% confident instead, and you want to control the maximal error of estimation to be 2 lbs, how many more college students need to be collected?

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