Question

An independent mail delivery service wants to study factors that affect the daily gas usage of its delivery trucks. Using data collected from different trucks on various days, a company analyst uses a software to fit a regression model of the form y=-19.4 + 73x1-15x2 + 4x3 + 0.09x4" where y volume of gasoline used (in gallons) x, weight of truck (in tons) x2 tire pressure (in psi, pounds per square inch) x 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 cefficient of t in this model. Holding the other variables fixed, what is the average change in daily fuel used for each additional ton that a truck weighs? gallon(s) O increase O decrease Is this change an increase or a decrease?

Answer 1