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Quiz 2 Sp10

# Quiz 2 Sp10 - and the midterm score was.5 Assume that the...

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Quiz 2 Statistics 21 Spring 2010 Ibser 1.)Suppose we have two sets of data A and B. a) Compute the correlation of X and Y of set A. b) Is there any number that could be put in the blank in set B which would make the correlation between X and Y equal to zero? If so, what number? If not, explain why not. c) Is there any number that could be put in the blank in set B which would make the correlation between X and Y equal to 1? If so, what number? If not, explain why not. Set A Set B X Y X Y -1 1 2 3 5 -3 1 5 11 3 1 2 3 4 5 1 5 3 ___ 1 2.) A Stat 21 class had 12 sections with 25 students in each section. Before taking their midterm, each student wrote down the number of hours spent studying for the midterm. The students averaged 12 hours of studying, with an SD of 3 hours of studying. The average score on the midterm was 70 with an SD of 8. The correlation between the number of hours studying
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Unformatted text preview: and the midterm score was .5. Assume that the scatter diagram has a football shape. a) Predict the midterm score of a student that studied 18 hours. b) Predict the number of hours studied by a student that had a midterm score in the 90th percentile. 3.) 30 men and 40 women attended a conference. The men had an average weight of 200 pounds with an SD of 20 pounds, and had an average height of 5'11 with an SD of 3 inches. The correlation of the height and weight of the men was .6. The women had an average weight of 140 pounds with an SD of 20 pounds, and had an average height of 5'2 with an SD of 3 inches. The correlation of the height and weight of the women was .5. Find the correlation of the height and weight of all 70 people that attended the conference....
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