In a study of the performance of a new engine design, the weight of 18 trucks (in tons) and the top speed (in mph) were recorded. A regression line was generated and shown to be an appropriate description of the relationship. The results of the regression analysis are below.

Depend Variable: Top Speed
Variable Constant Weight	Coefficient 3.221 0.5480	s.e. of Coeff 5.076 0.1056	t-ratio 0.63 5.19	prob 0.535 0.000
R squared = 67.7% R squared (adjusted) = 60.4%
s = 5.754 with 18 - 2 = 16 degrees of freedom

Part B: List the conditions for inference that need to be verified. Assuming these conditions have been met, does the data provide convincing evidence of a relationship between weight and top speed? Part C: Assuming all conditions for inference have been verified, determine a 95% confidence interval estimate for the slope of the regression line.