6167SP06.EX1 - Name_ STA 6167 Exam #1 Spring 2006 Attached...

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Name_________________________ STA 6167 Exam #1 Spring 2006 Attached are four pages of PROC REG output from regression models relating height (ht) to left hand span (lspan) and right hand span (rspan) in a group of 41 students. 1. Page 1 of the output shows the results of regressing ht on lspan. a. (15) Write the fitted regression equation for predicting ht based on lspan and construct a 95% CI for the slope. Equation: 95% CI for slope: b. (10) If Mary had lspan=8 and Jim had lspan=10, how much taller would you predict Jim is than Mary? c. (10) Write the interpretation of R 2 =.3566. d. (10) Page 2 shows the results of regressing ht on rspan. Do you think it would matter very much which hand is used to predict height? Explain your answer. e. (10) Page 3 shows the results of regressing ht on both lspan and rspan. There is an obvious problem with trying to make a meaningful interpretation of the lspan regression coefficient. What caused this problem?
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f. (10) Compute predicted heights for Mary and Jim using regression equations from pages 1 and 3, assuming lspan=rspan for each person.
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6167SP06.EX1 - Name_ STA 6167 Exam #1 Spring 2006 Attached...

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