1) a random sample of 64 customers is taken and their yearly value to the company is calculated. the calculated average value from the sample is $11 and the standard deviation calculated from the sample is $5 s=5. Find a 95% confidence interval for the population mean average value. show all work

2) Could you have used the results of the previous problem to test the following hypothesis at alpha = 0.10?

Ho: mu=$11 vs

Ha: mu greater than $11

if so, explain why and provide the answer. if not explain why