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# Final_F08_VersionA_AnswerKey - Economics 120A Fall 2008 Dr...

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Economics 120A Fall 2008 Dr. Maria Cândido 2 PART I: Multiple-Choice Questions (1.5 points each, 24 points total). Enter your answers in the provided Scantron. 1) Which of the following statements is true regarding the standard deviation? a. It cannot assume a negative value. b. If it is zero, then all the data values are the same. c. It is in the same units as the mean. d. All of the above are correct. 2) We want to a 99% confidence interval for the sample mean. The population standard deviation is known to be 15. We want our sampling error to be 5. How large should the sample be to accomplish that? a. About 240. b. About 60. c. About 35. d. About 25. 3) If you ask three strangers about their birthday, what is the probability that all were born on different days of the week? a. 0.714. b. 0.667. c. 0.630 d. 0.612. 4) The events A and B are independent. Suppose Pr(A) = 0.3 and Pr(B) = 0.10. What is the probability of either A or B occurring?
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Final_F08_VersionA_AnswerKey - Economics 120A Fall 2008 Dr...

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