STAT
Midterm 2A

# An association between two variables may reverse

• Notes
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13. An association between two variables may reverse direction when the data are broken down into groups according to a third variable. If this occurs, the situation is called: a. The law of Reversed Probability b. Bayes Rule c. Simpson’s Paradox d. None of the above. 14. If P ( A ) = 0.30, P ( B ) = 0.40 and P(B|A) = .60 then P(A and B) equals 15. If two events A and B are independent then: For Questions 16-18: Suppose the percentage of students who own cars is 40%. Choose two students at random. 16. What’s the chance that they both own a car? 17. What’s the chance that one owns a car and the other one doesn’t? a. 0.40 b. 0.24 c. 0.48 4

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d. None of the above 18. What’s the chance that at most one of them owns a car? 19. If everyone at Bob’s diner gets their salary doubled, what happens to the old mean and standard deviation of the salaries? 20. Suppose X is a random variable representing temperature in degrees F. Which of the following is NOT in degrees Fahrenheit? RECORD YOUR ANSWERS TO THE MULTIPLE CHOICE/TRUE FALSE QUESTIONS ON THE ANSWER SHEET ON THE LAST PAGE. WE WILL NOT GRADE MC/TF THAT ARE NOT ON THE ANSWER SHEET. SHOW YOUR WORK PROBLEMS: 10 problems, 10 points each IMPORTANT: USE NOTATION, LABELS, AND/OR SYMBOLS AS PART OF YOUR WORK. THEY ARE CONSIDERED TO BE PART OF YOUR GRADE.
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