Consider again the data in Exercise 29 about the gas mileage and weights of cars.
In exercise
A consumer organization has reported test data for 50 car models. We will examine the association between the weight of the car (in thousands of pounds) and the fuel efficiency (in miles per gallon). Use the data provided on the disk to answer the following questions, where the response variable is Fuel Efficiency (mpg).
a) Create a 95% confidence interval for the slope of the regression line.
b) Explain in this context what your confidence interval means.

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