Part A: A researcher wishes to estimate the average number of minutes per day a person spends on the Internet. How large

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Part A:
A researcher wishes to estimate the average number ofminutes per day a person spends on the Internet. How large a samplemust she select if she wishes to be 95 % confident that thepopulation mean is within 7 minutes of the sample mean? Assume thepopulation standard deviation is 39 minutes. Round your finalanswer up to the next whole number.
Part B:
It is desired to estimate the mean GPA of eachundergraduate class at a large university. How large a sample isnecessary to estimate the GPA within 0.21 at the 90%
confidence level? The population standard deviation is1.25. If needed, round your final answer up to the next wholenumber.