PracticeReview - Spring 2010 FORM C Name Last First Section...

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Spring 2010 FORM C Name Last:_____________________ First: ______________________ Exam 2: Ch. 4, 5, 6, 7 Section: 64z, 65z, 66z, 67z (circle) Directions: Put your NAME and CLASS TIME on THIS EXAM and on your SCANTRON. Write FORM C on your SCANTRON. Each question has exactly one BEST answer. There are 21 questions. You may write on this exam. There is no scratch paper allowed. Each question is worth 5 points for a total of 105 points. This includes 5 bonus points! If you have no note page, you must write NO NOTES on your SCANTRON. Put your SCANTRON and PAGE of NOTES inside your EXAM. When your exam is returned, you will get back all materials you turned in. Turn your cell phone OFF. Any noise from a cell phone will signal that your exam is over. FAILURE TO FOLLOW ALL OF THE ABOVE INSTRUCTIONS WILL COST YOU THE 5 BONUS POINTS ___________________________________________________________________________________ Questions 1 – 2 refer to the following: Last year, 66% of all federal income tax returns were filed electronically. (Source: http://www.irs.gov/newsroom/article/0,,id=218319,00.html?portlet=7 ). Suppose we randomly pick 9 federal tax returns from last year. We are interested in the number of them that were filed electronically. 1. The distribution for the random variable is: A. P(0.66) B. B(9, 0.66) C. P(1/9) D. B(0.66, 1/9) 2. Which of the following probabilities is the largest? 3. In the probability distribution function below, X = number of exam attempts to earn a drivers license. Find the expected long-term average. X P(X = x) 1 0.4 2 0.3 3 0.15 4 0.10 5 0.05
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Questions 4 – 6 refer to the following: U.S. college students spend an average of $900 on textbooks each year. Although not given on the web site, suppose that the data are normally distributed with a population standard deviation of $350. (Source: http://www.uspirg.org/higher-education/affordable-textbooks ) 4. Find the third quartile (rounded to nearest dollar) for the amount that U.S. college students spend in a year on textbooks. 5. What is the probability that a randomly selected individual spends at least $450? A. 0.0993 B. 0.6445 C. 0.9007 D. 1 6. Consider the two statements: I. a randomly chosen individual student spends at most $600 in a year on textbooks or II. 20 randomly chosen students spend an average of at most $600 in a year on textbooks? Which of the following is true?
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