Table 7.18 gives latitudes (Lat) and the mean monthly range (Range) between mean monthly maximum and minimum temperatures for a selected set of U.S. cities. (a) Perform a regression using Range as...

Table 7.18 gives latitudes (Lat) and the mean monthly range (Range) between mean monthly maximum and minimum temperatures for a selected set of U.S. cities.

(a) Perform a regression using Range as the dependent and Lat as the independent variable. Does the resulting regression make sense? Explain.

(b) Compute the residuals; find the largest positive and negative residuals. Do these residuals suggest a pattern? Describe a phenomenon that may explain these residuals.