Question: View the 989 donors in the donations database (out of 20,000 people represented on the companion site) as a random sample from a much larger population of people who would make a donation in response to the mailing. Note that the column of 989 donation amounts has been named "donation_D1."
a. Find the 95% confidence interval for the population mean donation amount.
b. Find the 99% confidence interval for the population mean donation amount.