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PracticeFinalExam - STAT 350 Practice Final Exam April 24...

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STAT 350 Practice Final Exam April 24, Spring 2011 NAME (print): Class Time (circle one): 1:30 PM 2:30 PM Instructions: You are expected to uphold The Honor Code of Purdue University. It is your responsibility to keep your work covered at all times. Anyone caught cheating in the final exam will automatically fail the course. You may have only THREE one-sided 8x11 crib sheet with notes handwritten in your own hand- writing to take this test. Please show ALL your work. Most questions are graded WITH partial credit, and an answer without showing any work may result in zero credit. After you complete the exam, please turn in your exam to your instructor, and sign the roster. 1
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Question Score max 1 5 2 5 3 5 4 20 5 20 6 15 7 30 8 10 total 110 / 100 . 2
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1 (5 points) Consider the set of points { ( - 2 , 5) , ( - 3 , 7) , ( - 4 , 9) , ( - 5 , 11) , ( - 10 , n ) } . What should n be so that the correlation between the x- and y-values is -1? 2. (5 points) Let X denote the number of customers who enter a bank in an hour. Suppose X has a Poisson distribution, and that P ( X = 0) = 0 . 05 . What is the average number of customers entering this bank in one hour? 3. (5 points) In a study of high school students, a positive correlation was found between hours spent per week doing homework, and scores on standardized achievement tests. In fact the correlation
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