E270 HW5 - HOMEWORK PROBLEM SET 5 1 a) b) c) d) A simple...

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HOMEWORK PROBLEM SET 5 1 a) 2.35 b) 2.68 c) 3.02 d) 4.21 2 a) 91.76 99.44 b) 89.64 101.56 c) 87.75 103.45 d) 86.22 104.98 3 a) 33.22 39.78 b) 31.06 41.94 c) 29.95 43.05 d) 28.85 44.15 Next three questions are based on the fol owing: 4 A 90% confidence interval. a) 22,157.1 24,242.9 b) 22,258.5 24,141.5 c) 22,565.4 23,834.6 d) 22,675.2 23,724.8 5 A 95% confidence interval. a) 21,767.2 24,632.8 b) 22,067.2 24,332.8 c) 22,270.4 24,129.6 d) 22,572.8 23,827.2 6 A 99% confidence interval. a) 22,874.6 23,525.4 b) 22,674.6 23,725.4 c) 22,374.4 24,025.6 d) 22,074.4 24,325.6 7 a) 280 b) 160 c) 128 d) 95 8 The fol owing data have been col ected for a sample from a normal population: 18 14 37 40 16 28 35 36 The margin of error for a 95% confidence interval for the population mean is ______. a) 7.30 b) 8.81 c) 9.63 d) 10.54 Next TWO questions are based on the fol owing: 9 Develop a 90% confidence interval for the population mean. a) 31.86 45.64 b) 32.26 45.24 c) 33.17 44.33 d) 34.14 43.36 10 Develop a 95% confidence interval for the population mean. a) 33.17 44.33 b) 31.98 45.52 c) 30.99 46.51 d) 30.39 47.11 11 The fol owing data show a sample of the prescription cost in dol ars for a drug used to lower cholesterol. 186 108 105 151 196 104 192 158 a) 126.86 173.14 b) 122.35 177.65 c) 116.63 183.37 d) 117.13 182.87 12 a) 85 b) 78 c) 71 d) 62 13 In the previous question, how large a sample should be used to provide a margin of error of $5? a)
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