Answered You can hire a professional tutor to get the answer.

# A simple random sample of 80 customers is taken from a customer information file and the average age is 34. The population standard deviation is...

A simple random sample of 80 customers is taken from a customer information file and the average age is 34. The population standard deviation σ is unknown. Instead the sample standard deviation s is also calculated from the sample and is found to be 5.5. (**6 points**)

- Test the hypothesis that the population mean age is greater than 30 using the critical value approach and a 0.05 level of significance.
- Test the hypothesis that the population mean age is less than 37 using the p-value approach and a 0.05 level of significance.
- Test the hypothesis that the population mean age is different from 31 using the p-value approach and a 0.05 level of significance