solhw2 - Solutions for HW 2 Yicheng Kang September 28, 2010...

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Unformatted text preview: Solutions for HW 2 Yicheng Kang September 28, 2010 1 Problem 2.4 a Categorical b Quantitive c Categorical d Quantitive 2 Problem 2.6 a Continuous b Discrete c Continuous d Discrete 1 3 Problem 2.8 a Quantitive b Discrete c 1216 + 710 + 1147 + 738 + 386 + 139 + 83 + 43 + 35 = 4497. No.children 1 2 3 4 5 6 7 8+ Count 1216 710 1147 738 386 139 83 43 35 Proportion .2704 .1578 .2550 .1641 .0858 .0309 .0184 .0095 .0077 Percentage 27.04 15.78 25.50 16.41 8.58 3.09 1.84 0.95 0.77 Table 1: No.Children d 0 is the mode because it has the most frequency. 4 Problem 2.15 a 17 | 8 18 | 19 | 9 20 | 0 21 | 00 22 | 55558 23 | 25 24 | 00056669 25 | 00055 b This plot gives us an overview of all the data. We see clearly that the prices fall between $ 178 and $255, with more PDAs selling at the upper end of this range. 2 5 Problem 2.16 a There are 33 students in the class; the minimum score is 65 and the maximum is 98....
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solhw2 - Solutions for HW 2 Yicheng Kang September 28, 2010...

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