Use the data in RestaurantTips to assess the conditions for doing inference on a regression line to predict the size of a customer’s tip, Tip, from the size of the bill, Bill. Explain your reasoning, using each of the three relevant graphs.

Data in RestaurantTips

The owner of a bistro called First Crush in Potsdam, New York, is interested in studying the tipping patterns of its patrons. He collected restaurant bills over a two-week period that he believes provide a good sample of his customers. The data from 157 bills are stored in RestaurantTips and include the amount of the bill, size of the tip, percentage tip, number of customers in the group, whether or not a credit card was used, day of the week, and a coded identity of the server.