Lecture 6 Notes. Note: I will e-mail homework 2 tonight. It will be due next Thursday. The Multiple Linear Regression model (Chapter 4.1) Inferences from multiple regression analysis (Chapter 4.2)
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(1) Which characteristics of the design are likely to affect mileage?
(2) A new car is planned to have the following characteristics: weight – 4000 lbs, horsepower – 200, cargo – 18 cubic feet, seating – 5 adults. Predict the new car’s gas mileage.
Degrees of freedom for t equals n-(K+1). Standard error of , , found on JMP output.
Decision rule for test: Reject H0 if or
p-value for testing is printed in JMP output under Prob>|t|.
Higher rainfall is associated with lower temperature.
Rainfall is estimated to be beneficial once temperature is held fixed.
Multiple regression provides a better picture of the benefits of
an irrigation scheme because temperature would be held fixed in
an irrigation scheme.