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# oldmidterm2 - ST 351 Midterm 2 70 points Fall 2005 Form 2...

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ST 351 Midterm 2 – 70 points Fall 2005 Form 2 Name Lecture Time Last 3 digits of Student ID # Part I: Multiple Choice. Darken the circle of the best answer on the Scantron sheet. (34 points possible: 2 points each, except where noted) 1. P(Z = 1.00) = a. 0 b. 0.1587 c. 0.8413 d. 0.6826 e. 0.3174 2. P(-2.4 < Z < 1.5) = a. 0.925 b. 0.075 c. 0.9414 d. 0.1336 e. 1.0586 Use the following situation to answer questions 3 through 6 Two dice (a red die and a green die) are rolled together. Let A = red die is a 6. Let B = green die is a 5. 3. B is the complement of A. a. This statement is true. b. This statement is not true. c. The truth of this statement cannot be determined from the information given. 4. A and B are independent. a. This statement is true. b. This statement is not true. c. The truth of this statement cannot be determined from the information given. 5. A and B are disjoint. a. This statement is true. b. This statement is not true. c. The truth of this statement cannot be determined from the information given. 6. Suppose the two dice are not fair and that P(A) = 0.2 and P(B)= 0.15. Calculate P(A and B). a. 0 b. 0.35 c. 0.32 d. 0.03 e. 0.30

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Use the following situation to answer questions 7 and 8 A family has three children. The probability that any one of their children will have blue eyes is 0.20. Each child’s eye color is independent of any other child’s eye color. Let X = the number of children with blue eyes. 7. X is a. independent. b. a categorical variable. c. a continuous random variable. d. a discrete random variable. e. normally distributed. 8. (3 points) Calculate the probability that exactly one child will have blue eyes. What is the first digit after the decimal point? a. 0 b. 1 c. 2 d. 3 e. 4 9. As the sample size gets larger, the distribution of sample means a. has a smaller standard deviation b. has a smaller mean c. looks more like the distribution of the data in the population d. all of the above e. only a and b above 10. The distribution of sample means will be approximately normal if
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## This note was uploaded on 04/07/2008 for the course ST 351 taught by Professor Kollath during the Spring '05 term at Oregon State.

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oldmidterm2 - ST 351 Midterm 2 70 points Fall 2005 Form 2...

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