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The accompanying regression table shows a regression of MSRP (manufacturer's suggested retail price) on both Displacement and Bore for off-road motorcycles. 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. Complete parts (a) and (b) below.

Variable Coeff SE (Coeff) t-ratio P-value
Intercept 314.68 1003 0.313 0.7549
Bore 41.31 25.61 1.6 0.1127
Displacement 6.521.34 3.968 1.64 0.1036