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Unformatted text preview: Stat 145: Exam 3 Review Questions Note: This is not intended to be a preview of the actual exam. Rather, it is meant to give you an idea of the types of questions that will be asked. There are concepts in these review problems that will not appear on the actual exam, just as there will be concepts on the actual exam that are not covered in these review problems. 1. The number of shark attacks per year in the United States is approximately Normally distributed with mean = 31 . 8 and standard deviation = 10.0, according to data obtained from the Florida Museum of Natural History. (a) What is the probability a year chosen at random has less than 15 attacks? (b) Suppose an SRS of 25 years is chosen. Let X be the sample mean number of attacks per year. What are the mean and standard deviation of the sampling distribution of X ? (c) Is the sampling distribution of X approximately Normal? Why or why not? (d) What is the probability that the mean number of attacks in the sampled years is greater than 35? 2. The 2000 census allowed each person to choose from a long list of races. That is, in the eyes of the Census Bureau, you belong to whatever race you say you belong to....
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 Summer '07
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