Although delays at major airports are less frequent it helps to know which airports are likely to throw off your schedule In addition if your plane is late arriving at a particular airport where you must make a connection how likely is it that the departure will be late and thus increase your chances of making the connection The following data show the percentage of late arrivals and departure during August for 13 airports.

Late Arrivals Late Departures Airport % % Atlanta 24 22 Charlotte 20 20 Chicago 30 29 Cincinnati 20 19 Dallas 20 22 Denver 23 23 Detroit 18 19 Houston 20 16 Minneapolis 18 18 Phoenix 21 22 Pittsburgh 25 22 Salt Lake City 18 17 St. Louis 16 16 a. Develop a scatter plot for these data with the percentage of late arrivals as the independent variable. b. What does the scatter diagram developed in part (a) indicate about the relationship between late arrivals and late departures? c. Use the least squares method to develop the estimated regression equation. d. Provide an interpretation for the slope of the estimated regression equation. e. How good is the model? Explain