Midterm_2_Sp_11

# If a and b are any two events with p a 8 and p b a 4

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2. If A and B are any two events with P ( A ) = .8 and P ( B | A ) = .4, then the probability of A and B is a. .80 b. .40 c. .32 by the multiplication rule d. None of the above, or can’t find with the information given 3. Which of the following is not true about a continuous random variable? 4. If Z = .40 that means 40% of the data lie below it. a. True b. False 5. P(Z = .5) = 0. a. TRUE b. FALSE Reason: Z means it is a standard normal distribution so here it is a continuous distribution. For continuous distribution, the probablity of any single point is 0. 6. If 75% of female business students major in accounting and 80% of male business students major in accounting, are gender and majoring in accounting independent? a. YES b . NO 7. The z-values running down the side of the Z-table are PERCENTILES. a. TRUE b. FALSE 8. On the Z distribution, P(Z > 2) = P(Z < -2) a. TRUE b. FALSE 9. If two events are independent, what is the probability that they both occur?

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10. Suppose the standard deviation of X equals 4. Then the standard deviation of -2X is equal to which of the following? #11-12: Bob is planning a trip to visit his cousin in Chicago. We want to compare the length of his trip (short or long) to whether or not he’ll forget to pack something important. Short trip Long trip Forgot something important 0.10 0.20 Didn’t forget something important 0.30 0.40 11. What can we tell from the probabilities in the above table? a. Bob forgets something important more often when he takes a short trip compared to a long trip. b. Bob forgets something important less often when he takes a short trip compared to a long trip. c. Bob forgets something important just as often when he’s on a short trip as he does on a long trip. P(F|S)=0.25<P(F|L)=0.33
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