Traffic delays, part 2.

Here’s a scatterplot of the residuals from the regression in Exercise 18 plotted against mean Highway mph.

a) The point plotted with an x is Los Angeles. Read the graph and explain what it says about traffic delays in Los Angeles and about the regression model.

b) Is Los Angeles likely to be an inf luential point in this regression?

Transcribed Image Text:

Residuals 7.5 0.0 -7.5 + 35 40 45 50 55 Highway mph