practice1

# practice1 - Table 1: Table for Exercise 1. VICTIMS Frequency

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Unformatted text preview: Table 1: Table for Exercise 1. VICTIMS Frequency Percent-------------------------------- 1244 90.8 1 81 5.9 2 27 2.0 3 11 0.8 4 4 0.3 5 2 0.1 6 1 0.1 N Mean Std Dev----------------------- 1370 0.146 0.546 SAMPLE QUESTIONS FOR EXAM 1 1. A recent General Social Survey asked respondents, “During the past 12 months, how many people have you known personally that were victims of homicide.” Table 1 shows a computer printout from analyzing responses for 1370 subjects. a. Does the Empirical Rule apply to this distribution. Why or why not? b. Based on the mean and standard deviation, explain what you would surmise about the shape of the distribution. 2. Find the z-score for the upper quartile of a normal distribution. 3. According to Current Population Reports , self-employed individuals in the United States in 2000 worked an average of 44.6 hours per week, with a standard de- viation of 14.5. Assuming this variable is approximately normally distributed, find the proportion who averaged more than 40 hours per week.find the proportion who averaged more than 40 hours per week....
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## This note was uploaded on 07/14/2011 for the course STA 101 taught by Professor Alan during the Fall '10 term at University of Florida.

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practice1 - Table 1: Table for Exercise 1. VICTIMS Frequency

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