Practice Final Exam AU10

Which of the following conditions must be met in

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1. Which of the following conditions must be met in order to use the normal approximation for a binomial? a. n > 30 b. np≥ 10 and np(1-p) ≥10 c. np≥10 and n(1-p)≥10 d. None of the above 2. If X has a Normal Distribution, then the sampling distribution of X : 3. Suppose Bob’s 95% confidence interval for the population mean is (70, 90). From this information you can determine what the value of X was for Bob’s data. a. YES b. NO 4. Which of the following DOES NOT make the margin of error of a confidence interval smaller? 5. It is possible to have two events where P ( A ) = 0.40, P ( B ) = 0.50, and P ( A and B ) = 0.30. a. True b. False 6. A random sample of size n is selected from some distribution X . As n increases , which of the following statements is true about X ? 7. x X μ = . a. True b. False 8. In a five-number summary, if you take Q 3 + Q 1 and divide by 2, you will get the median (Q 2 ). a. True b. False 7

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9. Given this table of data, what is the chance that a male will be home for break? a. 55/200 b. 55/150 c. 55/110 d. 55% Female Male Total Home for break 75 55 150 Not home for break 15 55 50 Total 90 110 200 10. You need to central limit theorem to be able to say that x x μ μ = . a. True b. False 11. You and Bob want to estimate the average weight of 5 year old children. Bob’s confidence interval has a margin of error of plus or minus 6 pounds. You want your margin of error to be 1/3 that size. Compare your sample size to Bob’s:
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