ST 512 Midterm: ST 512 NCSU Exam2 Fall06 key fixed
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Quiz 2 solutions: true or false: circle one (24 pts total) For the following three problems, consider a completely randomized design, with normally distributed errors with equal variances. A language aptitude test (z) is administered to n = 40 volunteers who are then randomized to t = 4 groups. They work abroad for two years and give a rating (y) of the usefulness of their program on their return (10 point scale). E(y |xl, xa, z) = 0 + 1xl + 2xa + 3xlxa + (z z). Techniques, indicator variables and sas code and output for a regression analysis are given below. Mean (se = (se = proc reg data=volunteers; model score = zdiff xl xa xla /covb; 3. 27 (a) report the extra sum of squares for technique before and after adjustment for the language aptitude test score. R( 1, 2, 3| 0) = r( 1, 2, 3, | 0) r( | 1, 2, 3, 0)
