In an article in Public Roads (1983), Bissell, Pilkington, Mason, and Woods study bridge safety (measured in accident rates per 100 million vehicles) and the difference between the width of the bridge and the width of the roadway approach (road plus shoulder):

a. Identify and interpret the least squares point estimate of the slope of the simple linear regression model.
b. Identify and interpret the p-value for testing H0: β1 = 0 versus Ha: β1 ‰  0.
c. Identify and interpret r2.

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WidthDiff.6 4-2 0 2 4 6 8 10 12 Accident 120 103 87 72 58 44 31 20 1 7