A manager is interested in determining the average hourly wage of individuals working at a branch of a major department store. She takes a random sample of 16 workers and calculates a mean of 22.52 and a standard deviation of 9.16. Assuming that the population distribution of hourly rates is normal, estimate with 90% confidence the mean hourly wage at the department store by answering the following questions.

i.Specify the formula for the 90% confidence interval estimator for the mean hourly wage