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Test2a_KEY_Sp11

Test2a_KEY_Sp11 - A Name 4 March 2011 IE330 Spring 2011...

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Name: ____________________________________________ A 4 March 2011 IE330 Spring 2011 Test 2a Closed book, closed notes, no calculators. Remain on this page until you are told to start. 1 of 6 ( 29 ( 29 ( 29 ( 29 ( 29 1 2 1 2 * 1 2 0 0 0 0 2 2 1 2 2 2 2 1 2 1 2 1 2 0 0 2 2 2 2 2 2 1 1 2 2 1 2 1 2 2 2 1 1 2 2 2 1 2 0 0 1 2 1 2 1 2 0 Some helpful test statistics: / , / / 1 1 1 1 , 2 1 1 ˆ ˆ ˆ ˆ 1 D p p X X D Z T S n n n S S n n X X T s s S n S n n n n n n S n S X X T S n n S n n P P Z P P σ σ υ - - ∆ - ∆ = = + + - - ∆ = = + + - - - + - - - ∆ = = + - + - = - 1 2 2 1 2 2 1 1 n n S F S + =
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Name: ____________________________________________ A 1. (10 points) In a regression of y vs. x , which of the following assumptions must be checked to determine whether the regression can be considered valid or not, regardless of its significance? (Choose all that are correct.) a. That the residuals are linear with respect to x b. The p-value of 0 β c. The magnitude of the residuals d. That the residuals have constant variance e. The 2 R value of the regression f. None of the above 2. (5 points) (True or
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