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Intro to Stat_Part_3

# Intro to Stat_Part_3 - 23 B All Lake Tahoe Community...

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23 B. All Lake Tahoe Community College English students C. All Lake Tahoe Community College students in her classes D. All Lake Tahoe Community College math students Exercise 1.20 (Solution on p. 27.) Consider the following: X = number of days a Lake Tahoe Community College math student is absent In this case, X is an example of a: A. Variable B. Population C. Statistic D. Data Exercise 1.21 (Solution on p. 27.) The instructor takes her sample by gathering data on 5 randomly selected students from each Lake Tahoe Community College math class. The type of sampling she used is A. Cluster sampling B. Stratified sampling C. Simple random sampling D. Convenience sampling Exercise 1.22 (Solution on p. 27.) The instructor’s sample produces an average number of days absent of 3.5 days. This value is an example of a A. Parameter B. Data C. Statistic D. Variable The next two questions refer to the following relative frequency table on hurricanes that have made direct hits on the U.S between 1851 and 2004. Hurricanes are given a strength category rating based on the minimum wind speed generated by the storm. ( http://www.nhc.noaa.gov/gifs/table5.gif [ ? ]) Frequency of Hurricane Direct Hits Category Number of Direct Hits Relative Frequency Cumulative Frequency 1 109 0.3993 0.3993 2 72 0.2637 0.6630 3 71 0.2601 4 18 0.9890 5 3 0.0110 1.0000 Total = 273 Table 1.5

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24 CHAPTER 1. SAMPLING AND DATA Exercise 1.23 (Solution on p. 27.) What is the relative frequency of direct hits that were category 4 hurricanes?
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