Exam 3

Exam 3 - 1. Experimental Unit: Current College Students...

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1. Experimental Unit: Current College Students Dependent Variable: GPA (point average) Independent Quantitative Variables: Age(years) Independent Qualitative: 1 if female and 0 if male 2. No extreme multicolinearity since correlation between Age(x1) and gender (x2) is less than .3. PO3 3. Y-outliers: None, no cases that contain a standard residual greater than 3 in absolute value Y-suspect outliers: 4, 36; strd. Residuals between 2 and 3 in absolute value. X-outliers: no; no age value far away from all other x1 values 4. Test for Curvature a)Complete: E(y)= B 0 + B 1 x 1 +B 2 x 1 2 + B 3 x 2 +B 4 x 1 x 2 + B 5 x 1 2 x 2 b) Reduced: E(y)= B 0 + B 1 x 1 + B 2 x 2 + B 3 x 1 x 2 Test for curvature: Ho: B 4 =B 5 =0 Ha: At least 1 B different c) P-value: .42 d) Alpha: .05 e)Fail to reject Ho: Insufficient evidence of curvature in a relationship between GPA(y) and age(x1) PO 5 5. Test for Interaction a) Complete Model: E(y)= B 0 + B 1 x 1 + B 3 x 2 + B 4 x 1 x 2 b) Reduced Model: B 0 + B 1 x
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Exam 3 - 1. Experimental Unit: Current College Students...

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