95% confidence interval?????

Question

A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: =$50.50 and s2 =400. Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall, assuming that the amount spent follows a normal distribution.

Answer 1

I went to school to learn that issue.  It takes time but I ALLWAYS SOLVED my own problems.  Subsequently I remembered the answers.  Always depend on yourself for all your own problems.  You will be a much better succsess.

Answer 2

Stats is the worst class i ever took.  Sorry man.