PracticeReview - Spring 2010 FORM C Name Last:_ First: _...

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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? A. P(X < 0.66) B. P(X = 6) C. P(X ≤ 2) D. P(X ≥ 7) 3. In the probability distribution function below, X = number of exam attempts to earn a drivers license. Find the expected long-term average. A. 1.8 B. 2.1 C. 1 D. 3 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. A. $675 B. $1050 C. $1136 D. $1552 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? A. The probability of statement I is greater than the probability of statement II. B. The probability of statement II is greater than the probability of statement I. C.
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PracticeReview - Spring 2010 FORM C Name Last:_ First: _...

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