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# HW3 - Stat 512 Due Friday Sep 25th Homework#3 Dr Levine 1...

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Stat 512 Homework #3 Dr. Levine Due Friday, Sep 25th 1. KNNL Problem 2.26, p93 . To change the axis on a plot, add an “order” statement to the axis definition. For example, to make the vertical axis go from -30 to 30 in increments of 10, do axis3 label=(angle=90 Res iduals’ ) order=(-30 to 30 by 10); Then use vaxis=axis3 as an option to the plot statement, along with haxis and vref=0 . The mean value of Y appears as Dependent Mean in the output from proc reg . 2. KNNL Problem 2.31. 3. Given that R 2 = SSM/SST, it can be shown that R 2 / (1 R 2 ) = SSM / SSE. If you have n = 28 cases and R 2 = 0.35, what is the F statistic for the test that the slope is equal to zero? 4. KNNL Problem 2.54 5. KNNL Problem 2.55 6. KNNL Problem 2.57, p98. (The degrees of freedom df R referred to in the problem are error degrees of freedom for the reduced model, i.e. df E(R) ). For the next three problems use the grade point average data described in the text with KNNL problem 1.19. 7. Describe the distribution of the explanatory variable. Show the plots and output that were helpful in learning about this variable.

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