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Practice%20Problems%20-%20Answers

Practice%20Problems%20-%20Answers - Chapter 1 1.17 1.18...

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Chapter 1 1.17 Ordinal, nominative, ordinal, nominative, ordinal, and nominative. 1.18 Nominative, ordinal, ordinal, ordinal, nominative, and nominative.
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Chapter 2 2.7 a. Pizza Restaurant Frequency Relative Frequency Godfather’s 3 0.12 Papa John’s 9 0.36 Little Caesar’s 2 0.08 Pizza Hut 6 0.24 Domino’s 5 0.20 b. Percentage Bar Chart For Pizza Restaurant 0% 5% 10% 15% 20% 25% 30% 35% 40% Godfather's Papa John's Little Caeser's Pizza Hut Domino's Restaurant Percent c. Pie Chart For Pizza Restaurant 12% 36% 8% 24% 20% Godfather's Papa John's Little Caeser's Pizza Hut Domino's d. Most popular is Papa John’s and least popular is Little Caeser’s. 2.18 a. 6 classes because there are 60 data points (from Table 2.5). b. Class Length (CL) = (35 – 20) / 6 = 2.5 and we round up to 3. c. 20 x < 23, 23 x < 26, 26 x < 29, 29 x < 32, 32 x < 35, 35 x < 38
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d. lower upper Freque ncy Percent Freque ncy Cumula tive frequen cy Cumulative percent 20 - 22 2 3.3 2 3.3 23 - 25 3 5.0 5 8.3 26 - 28 9 15.0 14 23.3 29 - 31 19 31.7 33 55.0 32 - 34 26 43.3 59 98.3 35 - 38 1 1.7 60 100.0 60 100 e. Distribution shape is skewed left. 2.19 a & b. lower upper Freque ncy Percent Freque ncy Cumula tive frequen cy Cumulative percent 20 - 22 2 3.3 2 3.3 23 - 25 3 5.0 5 8.3 26 - 28 9 15.0 14 23.3 29 - 31 19 31.7 33 55.0 32 - 34 26 43.3 59 98.3 35 - 38 1 1.7 60 100.0 60 100 c. Ogive 0.0 25.0 50.0 75.0 100.0 17 20 23 26 29 32 35 Rating Cumulative Percent
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Chapter 3 3.3 N MEAN MEDIAN MODE a 10 9.600 10.000 10.00 b 9 103.33 100.00 90.00 3.20 Housing Affordability in Texas Mean (µ) = (57.5 + 61.7 + 32.5 + 67.4 + 55.7 + 49.2) / 6 = 54 x (x – µ) (x – µ)**2 sum(x – µ)**2 σ 2 σ 57.5 3.5 12.25 739.28 123.21 11.10 61.7 7.7 59.29 32.5 –21.5 462.25 67.4 13.4 179.56 55.7 1.7 2.89 49.2 -4.8 23.04 Range = 67.4 – 32.5 = 34.9 Variance (σ 2 ) = 123.21 Std Deviation (σ) = 11.10 3.24 a. It is somewhat reasonable because the distribution is approximately symmetric.
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