Question: 5.9 Outsourcing by airlines. Exercise 4.4 (page 76) gives data for 14 airlines on the percent of rnajor maintenance outsourced and the percent of flight

5.9 Outsourcing by airlines. Exercise 4.4 (page 76) gives data for 14 airlines on the percent of rnajor maintenance outsourced and the percent of flight delays blamed pn the airline.

(a) Make a scatterplot with outsourcing percent as x and delay percent as y. Hawaiian Airlines is a high outlier in the y direction. Because several other airlines have similar values of x, the influence of this outlier is unclear without actual calculation.

(b) Find the correlation r with and without Hawaiian Airlines. How influential is the outlier for correlation?

(c) Find the least-squares line for predicting y from x with and without Hawaiian Air lines. Draw both lines on your scatterplot. Use both lines to predict the percent of delays blamed on an airline that has outsourced 76% of its major maintenance. How influential is the outlier for the least-squares line?

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