How's your mileage? Weight (in tons) and fuel economy (in mpg) were measured for a sample of seven diesel trucks. The results are presented in the following table.

a. Compute the least-squares regression line for predicting mileage (y) from weight (x).
b. Construct a 95% confidence interval for the slope.
c. Test Ho: β1 = 0 versus HI: β

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Weight Mileage 8.00 24.50 4.97 27.00 14.50 28.50 649 7.69 4.56 12.75 21.25 4.34 6.24 4.45