Stats An independent mail delivery service wants to study factors that affect th

Question

Stats An independent mail delivery service wants to study factors that affect the daily gas usage of its delivery trucks. Using data from different trucks on various days, a company analyst uses a software to fit a regression model of the form y = 903 +82x1-45x2 + 2x3+00e4- where y = volume of gasoline used (in gallons) x, = weight of truck (in tons) x2 = tire pressure (in psi, pounds per square inch) = weight of initial package load (in hundreds of pounds) = total distance driven while delivering packages (in miles) Answer the following questions for the interpretation of the coefficient of x, in this model. Holding the other variables fixed, what is the average change in daily fuel used for each addtional mile that a truck is driven? gallon(s) is this change an increase or a decrease? Clear Undo Next >> Explain 0 Type here to search

Explanation / Answer

a) For each unit increase of x4 variable, there is a change of 90 galons

b) This change is an increase because x4 has positive coefficient

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