Exercise 17 shows computer output examining the association between the length of a movie and its cost.

a) Check the assumptions and conditions for inference.
b) Find a 95% confidence interval for the slope and interpret it.

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200 150 100 50 80 100 120 140 160 180 200 Run Time (minutes Dependent variable is: Budget SM) R-squared = 15.4% 32.95 with 120 2118 degrees of freedom Variable Coefficient SE(Coeff) t-Ratio P-Value Intercept 31.39 Run time 17.12 0.15 1.83 0.0693 4.64 <0.0001 0.71 100 20 40 60 80 100 120 140 100 Normal Scores