The following data represent the number of licensed drivers in various age groups and the number of fatal accidents within the age group by gender.

(a) Find the least-squares regression line for males treating number of licensed drivers as the explanatory variable, x, and number of fatal crashes, y, as the response variable. Repeat this procedure for females.
(b) Interpret the slope of the least-squares regression line for each gender, if appropriate. How might an insurance company use this information?
(c) Was the number of fatal accidents for 16- to 20-year-old males above or below average? Was the number of fatal accidents for 21- to 24-year-old-males above or below average? Was the number of fatal accidents for males greater than 74 years old above or below average? How might an insurance company use this information? Does the same relationship hold for females?

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Age Number of Number Number of Number Male Licensed of Fatal Female Licensed of Fatal Drivers (000s) Crashes Drivers (000s) Crashes <16 16-20 21-24 25-34 35-44 45-54 12 6,424 6,941 18,068 20,406 19,898 55-64 14,340 8,194 4,803 227 5,180 5,016 8,595 7,990 7,118 4,527 2,274 2,022 12 6,139 6,816 17,664 20,063 19,984 14,441 8,400 5,375 2,113 1,531 2,780 2,742 2,285 1,514 938 980 65-74 >74