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SocSci 9C Test 2 2007

# SocSci 9C Test 2 2007 - NAME TEST PROBABILITY AND...

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NAME: _______________________________ I.D.: _________________________________ TEST PROBABILITY AND STATISTICS, 9C APRIL 27, 2007 1-2. (two-questions – twenty points) Calculate Spearman’s rho for the following data. Reminder: You’ll need to order it first. HT WT 68 180 72 170 70 150 66 140 62 120 64 160 3. If Σ D 2 conveys the information about the strength and direction of the relationship, why do we need the rest of the formula for Spearman’s rho? Why don’t we just calculate Σ D 2 ? 4. What is the one point in a scatter diagram that we always know the regression line goes through? [The intercept is obviously not a correct answer.] 5. There is a standardized regression equation. It is for height and weight. It says WT = a + 0.6HT. The standard deviation of height is 3 inches and the standard deviation of weight is 35 pounds. If there is one group that is one standard deviation (three inches) taller than another group, what is the predicted difference in their average weights (in pounds, please)? 6. The regression line is the line that minimizes what?

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SocSci 9C Test 2 2007 - NAME TEST PROBABILITY AND...

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