Refer to Exercise 4, where we are trying to link average hourly wage (x) to employee turnover

Question:

Refer to Exercise 4, where we are trying to link average hourly wage (x) to employee turnover (y). The estimated regression equation turned out to be ŷ = 139.2 – 6.7x. Show the 95% confidence interval estimate of the expected turnover rate for the population of all companies with an average hourly wage of $ 15.