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Practice Test 3 dan - Practice Test(Review AP Statistics...

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Practice Test (Review) AP Statistics: HW#12 Name: Directions: Work on these sheets. A standard normal table is attached. Due: Oct. 13 Part 1: Multiple Choice Circle the letter corresponding the best answer. 1. A study found correlation r = 0.61 between the sex of a worker and his or her income. You conclude that (a) Women earn more than men on the average. (b) Women earn less than men on average. (c) An arithmetic mistake was made; this is not a possible value of r . (d) This is nonsense because r makes no sense here. 2. A copy machine dealer has data on the number x of copy machines at each of 89 customer locations and the number y of service calls in a month at each location. Summary calculations give x = 8.4, s x = 2.1, y = 14.2, s y = 3.8, and r = 0.86. What is the slope of the least squares regression line of number of service calls on number of copiers? (a) 0.86 (b) 1.56 (c) 0.48 (d) None of these (e) Can’t tell from the information given 3. In the setting of the previous problem, about what percent of the variation in the number of service calls is explained by the linear relation between number of service calls and number of machines? 4. If dataset A of (x,y) data has correlation coefficient r = 0.65, and a second dataset B has correlation r = –0.65, then (a) The points in A exhibit a stronger linear association than B.
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