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final(spring2002)-1

# final(spring2002)-1 - 0 ENGRD 270 Spring 2002 Final Exam...

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Problem 1. (10 points through problem 1) A random sample of size n = 100 was drawn from a population. A histogram of the data is shown in the figure. a. (5 pts) Multiple choice. The histogram indicates the distribution is: A. normal B. chi-squared C. light-tailed D. heavy-tailed b. (5 pts) Multiple choice. Let X be a random variable for an observation from the population discussed above. Suppose the population mean μ and population variance σ 2 are known. After assuming that the population is normal a probablist calculates - = σ μ 5 ) 5 ( Z P X P . Assuming she makes no calculation errors, she: A. overestimates the true probability B. underestimates the true probability C. gets the true probability exactly right D. still cannot calculate the true probability because of random variation. Problem 2. (20 points through problem 2) Suppose that among engineering students, 13% of men and 9% of women are left-handed. a. (5 pts) Assuming 22% of the engineering students are women, what is the probability that a randomly selected engineering student is left-handed? b. (5 pts) Suppose in the course of her Cornell undergraduate career, a woman has 5 boyfriends who are all engineering students. If the boyfriends are randomly selected, what is the probability that there would be 3 or more left-handers in her sample of 5 boyfriends?
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final(spring2002)-1 - 0 ENGRD 270 Spring 2002 Final Exam...

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