=+42. Motorcycles, part 2. In Exercise 41, we saw data on offroad motorcycles and examined scatterplots. Review those scatterplots. Here’s a regression of MSRP on both Displacement and Bore. Both of the predictors are measures of the size of the engine. The displacement is the total volume of air and fuel mixture that an engine can draw in during one cycle. The bore is the diameter of the cylinders.

Dependent variable is: MSRP R squared = 77.0% R squared (adjusted) = 76.5%

s = 979.8 with 98 - 3 = 95 degrees of freedom Variable Coeff SE(Coeff) t-ratio P-value Intercept 318.352 1002 0.318 0.7515 Bore 41.1650 25.37 1.62 0.1080 Displacement 6.57069 3.232 2.03 0.0449