Consider the mean cost of getting a four-year college degree.The middle interval which captures 95% of mean costs from samples of 36 graduates is ($50,500, 55,800).What is the population mean cost of getting a college degree?

in the previous question, suppose we want to build a middle interval which captures 95% of the sample means within $1,000 from the population mean.What is the minimum sample size that would yield such an interval?