Exam 2a Sp 07 KEY - ECON 2843 Exam 2 Spring 2007 Form A...

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ECON 2843 Name KEY Exam 2 ID # Spring 2007 Lab Instructor Form A Lab Meeting Time Students must show all work on problems that involve calculation, even if the answer is multiple choice. Questions 1 – 3 refer to the following. Scores on an entrance examination for both Business students and Arts and Sciences students are normally distributed. Those students with scores over 450 will have priority in registration. 1. If scores for Arts and Sciences graduates have a mean of 500 and a standard deviation of 40, what is the probability that an Arts and Sciences graduate will have priority in registration? (5 points) a. .1056 b. .1250 c. .6844 d. .8944 * e. .9500 2. If scores for Business graduates have a mean of 420 and a standard deviation of 50, what is the probability that a Business graduate will have priority in registration? (5 points) .2743 3. Suppose that we randomly sample 108 Business students. What is the probability that over half of them will have priority in registration? (5 points) Approximately 0 1
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4. Circle true or false. The sample standard deviation is an unbiased estimator of the population standard deviation. (5 points)
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Exam 2a Sp 07 KEY - ECON 2843 Exam 2 Spring 2007 Form A...

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