dis1.prob

dis1.prob - c. Some pollsters prefer to select a sample of

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1.12 Election 2008 During the spring of 2006 the news media were already conducting opinion polls that tracked the fortunes of the major candidates hoping to become the president of the United States. One such poll conducted by Financial Dynamics showed the fol- lowing results: I "Thinking ahead to the next presidential election. jf the 2008 election were held today and the candidates were Democrat {see below I and Republican rsee below I. for whom would you vote'!" Hillary McCain/A) Clinton (0) Unsure % % % 46 42 13 John McCain AI Gore Unsure % % % 51 33 15 Audy Hillary Giuliani Clinton Unsure % % % 49 40 12 Audy Giuliani AI Gore Unsure % % % 50 13 Source: WWW.poliingreport.com The results were based on a sample taken May 16-18, 2006, of 900 registered voters nationwide. a. If the pollsters were planning to use these results to predict the outcome of the 2008 presidential election, describe the population of interest to them. b. Describe the actual population from which the sample was drawn.
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Unformatted text preview: c. Some pollsters prefer to select a sample of "likely" voters. What is the difference between "registered voters" and "likely voters"? Why is this important? d. Is the sample selected by the pollsters representative of the population described in part a? Ex.plain. 1.18 Construct stem and leaf pia for these EX0118 50 measurements. ~ UyeteJ \t" dAIS III 3.1 4.9 2.B 36 2.5 45 3.5 3.7 4.1 4.9 2.9 2.1 35 4.0 3.7 2.7 4.0 4.4 3.7 4.2 3.B 6.2 2.5 2.9 2.B 5.1 1.8 5.6 2.2 3.4 2.5 3.6 5.1 4.8 1.6 3.6 6.1 4.7 3.9 3.9 4.3 5.7 3.7 4.6 4.0 5.6 4.9 4.2 3.1 3.9 1.19 Refer to Exercise 1.18. Construct a relative fre-quency histogram for the data. a. Approximately how many class intervals should you use? b. Suppose you decide to use classes starting at 1.6 with a class width of.5 (i.e., 1.6 to <2.1,2.1 to <2.6). Construct the relative frequency histogram for the data. c. What fraction of the measurements are less than 5.1 ? d. What fraction of the measurements are larger than 3.6?...
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dis1.prob - c. Some pollsters prefer to select a sample of

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