Test3a_KEY_Sp11

# Test3a_KEY_Sp11 - Name_KEY A 13 April 2011 IE330 Spring...

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Name: _________________KEY___________________________ A 1 of 7 13 April 2011 IE330 Spring 2011 Test 3a No calculators, closed book, closed notes. Do not tear off any pages.

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Name: _________________KEY___________________________ A 3 of 7 For the following questions, refer to this multiple linear regression, where tomato yield (in bushels) is regressed against fertilizer used (in pounds) and the number of times per week the tomatoes were watered 1 . Assume all assumptions of the regression have been met unless otherwise indicated. Regression Equation Tomato Yield (bushels) = 17.6489 + 0.390642 Fertilizer (lbs) - 0.233957 Water frequency (per week) Term Coef SE Coef T P VIF Constant 17.6489 2.52745 6.98290 0.000 Fertilizer (lbs) 0.3906 0.09383 4.16334 0.000 1.13369 Water frequency (per week) -0.2340 0.80552 -0.29044 _____ 1.13369 S = 3.11562 R-Sq = 48.46% R-Sq(adj) = 43.78% Analysis of Variance Source DF Seq SS Adj SS Adj MS F P Regression 2 200.819 200.819 100.409 10.3439 0.000681 Fertilizer (lbs) 1 200.000 168.257 168.257 17.3334 0.000405 Water frequency (per week) 1 0.819 0.819 0.819 0.0844 ________ Error 22 213.556 213.556 9.707 No unusual observations 1. 3 points (True or False) Because the p-value of the constant is less than 0.05, the regression is considered significant. 2. 3 points (True or False) The p-value of “Water frequency (per week)” is greater than 0.05 in both the regression and ANOVA tables. 3. 3 points (True or False) “No unusual observations” suggests that the assumption of a linear relationship between the response and predictors has been met.

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Test3a_KEY_Sp11 - Name_KEY A 13 April 2011 IE330 Spring...

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