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Consider a linear regression model estimating the fuel efficiency of a car in terms miles per gallon of gas (mpg) based on its origin (region A, B or C) and number of cylinders with the following formula:
m p g = b 0 + b 1 ∗ R e g i o n B + b 2 ∗ R e g i o n C + b 3 ∗ C y l i n d e r s
The estimated values of the regression coefficients are provided below:
b 0 = 40.7 b 1= -0.91 b 2 = 2.66 b 3= -3.15
Based on this model, if X is the mpg of a car with 4 cylinders originated from region B, and Z is the mpg of a car with 3 cylinders originated from region A, what is the value of X - Z?
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