MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Researchers at a car resale company are trying to build a model to predict a car’s 4-
year resale value (in thousands of dollars) from several predictor variables. The variables they
selected follow.
a) What is the equation of the least-squares regression line? A particular car (not a
truck) cost $40,000 and has an engine of 3.8 liters. What do you predict the 4-year resale
value of this car will be?
b) Use α = 0.05 to test the significance of β1. Should x1 be dropped from the model?
c) Test if there exists any linear relationship between the dependent variable and any
of the independent variables, i.e., test H0 : B1=B2=B3= 0 at 5% significance level.
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