Question

An independent mal 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 9--11.7+99x,-1.8x+5x, +0.09x4 where C y = volume of gasoline used in gallons) X, - weight of truck (in tons) X2 - tire pressure (in psi, pounds per square inch) x2 weight of initial package load (in hundreds of pounds) *4 = total distance driven while delivering packages (in miles) Answer the following questions for the interpretation of the coefficient of Xy in this model Holding the other variables foed, what is the average change in daily fuel used for each additional to that a truck weighs? gallon(s) Is this change an increase or a decrease? increase decrease

Answer 1

Pago Date Given Regression equation y=-11.7+9.92* 1.8x2 tsa to.og sen where y-volume of gasoline used, 4: weight of truck u tire pressure weight of initial package loced au total distance driven while delivering packages. Holding other variables dixed the average change in darily fuel. Used for each additional ton that a truck weigusa 9.9 gallons. is an This change increases.