# Question

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 < 0. Can you conclude that weight is useful in predicting mileage? Use the α = 0.05 level of significance.

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 < 0. Can you conclude that weight is useful in predicting mileage? Use the α = 0.05 level of significance.

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