Explain why this distinction is not important for the

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Unformatted text preview: placement when the player is in random-selection mode. Explain why this distinction is not important for the construction of the interval in part (a). 5. An advertising agency in a large city is conducting a survey of adults to investigate whether there is an association between highest level of educational achievement and primary source for news. The company takes a random sample of 2,500 adults in the city. The results are shown in the table below. Primary Source for News Newspapers Local television Cable television Internet None Total HIGHEST LEVEL OF EDUCATIONAL ACHIEVEMENT Not High High School Graduate College Graduate School But Not College Graduate Graduate 49 205 188 90 170 75 113 496 147 41 401 245 77 165 38 370 1,437 693 Total 442 335 756 687 280 2,500 (a) If an adult is to be selected at random from this sample, what is the probability that the selected adult is a college graduate or obtains news primarily from the internet? (b) If an adult who is a college graduate is to be selected at random from this sample, what is the probability that the selected adult obtains news primarily from the internet? (c) When selecting an adult at random from the sample of 2,500 adults, are the events “is a college graduate” and “obtains news primarily from the internet” independent? Justify your answer. (d) The company wants to conduct a statistical test to investigate whether there is an association between educational achievement and primary source for news for adults in the city. What is the name of the statistical test that should be used? What are the appropriate degrees of freedom for this test? © 2010 The College Board. Visit the College Board on the Web: www.collegeboard.com. GO ON TO THE NEXT PAGE. -8- 2010 AP® STATISTICS FREE-RESPONSE QUESTIONS (Form B) STATISTICS SECTION II Part B Question 6 Spend about 25 minutes on this part of the exam. Percent of Section II score—25 Directions: Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods as well as o...
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This note was uploaded on 04/18/2013 for the course AP STATIST AP Statist taught by Professor Clarken during the Spring '13 term at Evergreen Center.

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