Many small restaurants in Portland, Oregon, and other cities across the United States do not take reservations. Owners say that with smaller capacity, noshows are costly, and they would rather have their staff focused on customer service rather than maintaining a reservation system (pressherald). However, it is important to be able to give reasonable estimates of waiting time when customers arrive and put their name on the waiting list. The file RestaurantLine contains observations of number of people in line ahead of a customer (independent variable ) and actual waiting time (dependent variable y). The estimated regression equation is: -4.35+8.81x and MSE= 94.42 Required:
Develop a point estimate (in min) for a customer who arrives with four people on the wait-ist.