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Math · Statistics And Probability
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8.3-6 Consider the regression model that relates gas mileage and weight of biles. Thirty-eight from the model 1978-1979 were selected, and their weights (in units of 1000 pounds) and fuel efficiencies mpg (miles per gallon) were measured. The results are listed in the following table (these data are ana- lyzed in Example 8.3-1 here, we ask you to repeat the analysis with locally avail able computer software): Weight mpg Weight mpg 4,360 16.9 3.830 18.2. 4.054 15.5 2.585 26.5 3.605 19.2 2.910 21.9 18.5 1.975 3.940 35.1 2.155 30.0 1.915 2.560 27.5 2.670 27.4 2.300 27.2 1.990 31.5 2.230 30.9 2.135 29.5 2.830 20.3 2.670 28.4 3.140 17.0 2.595 28.8 2.795 21.6 2.700 26.8 33.5 2.556 16.2 3.410 34.2 20.6. 3.380 3.070 20.8 2.020 31.8 3.620 18.6 2.130 37.3 3.410 18.1 2.190 30.5 3.840 17.0 2.815 22.0 3.725 17.6 2.600 21.5 3.955 16.5 1.925 31.9 (a) Make a scatter plot of mpg against weight, and discuss whether the simple linear regression model mpg Bo tr B1 (weight) is appropriate.
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