Quiz 2 solutions - ECO220 Quiz#1(June 8 2006 FORM 01 SOLUTIONS Page 1 of 2(1 Suppose a researcher surveys 349 parents to ascertain their views on

Quiz 2 solutions - ECO220 Quiz#1(June 8 2006 FORM 01...

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ECO220 Quiz #1 (June 8, 2006) FORM 01 Page 1 of 2 SOLUTIONS (1) Suppose a researcher surveys 349 parents to ascertain their views on proposed curriculum reform for public schools. What kind of data will this survey generate? (A) (2) Considering the graph to the right, approximately what fraction of the observations of X are less than or equal to 1? (C) (3) If a sample is taken from a negatively skewed population, which of the following would be expected to occur? (A) (4) Which of the following statements about the response rate is true ? (D) (5) Considering the reported summary statistics, which is the most reasonable inference about the shape of the population? (A) (6) Which of the following statements about these data is most correct? (E) (7) In a survey used to make inferences about all employees, which of the following is most likely to cause selection bias? (C) (8) Suppose the coefficient of correlation between X and Y is 0.67 and 59 . 587 , 27 . 334 , 33 . 451 , 81 . 22 2 2 = = = = Y X s s Y X . A one unit increase in X is associated with how much of a change in Y?
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