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Unformatted text preview: DSC 330 HW4 Do not turn in All statistical tests should be done at u1D6FC = 5% level and you must clearly indicate the degree of freedom when you construct a rejection region. 1. Answer the following questions based on the dataset “Boston Electricity”, which can be downloaded from blackboard. The response variable ( u1D44C ) is LOAD and the predictor ( u1D465 ) is TEMPERATURE. (a) Write the definitions of simple linear regression, quadratic regression and cubic regression models, respectively (b) Fit the above three models using SPSS. (c) Compare model 1 with model 2 by doing an F-test and a t-test, respectively. (d) Compare model 1 with model 3 by doing an F-test. (You should understand why the t-test does not work for this question.) (e) Suppose the quadratic regression is being used. Do we need to introduce u1D465 3 into this model? Answer this question by dong an F-test and a t-test, respectively....
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This note was uploaded on 01/29/2012 for the course DSC 330 taught by Professor Staff during the Spring '08 term at University of Oregon.
- Spring '08