APPENDIX D 769 35. An outlier can dramatically increase the number of classes. Weight (lb) With Outlier Without Outlier 200–219 6 6 220–239 5 5 240–259 12 12 260–279 36 36 280–299 87 87 300–319 28 28 320–339 0 340–359 0 360–379 0 380–399 0 400–419 0 420–439 0 440–459 0 460–479 0 480–499 0 500–519 1 Section 2-2 1. The histogram should be bell-shaped. 3. With a data set that is so small, the true nature of the distribution cannot be seen with a histogram. 5. 40 7. The shape of the graph would not change. The vertical scale would be different, but the relative heights of the bars would be the same. 9. Because the data are skewed to the right, the histogram does not appear to depict data from a population with a normal distribution. 11. Because it is far from being bell-shaped, the histogram does not appear to depict data from a population with a normal distribution. 27. No. The United States has 37.1% of the cost of piracy for only the five countries listed, not the total cost of piracy for all countries. Because only the top five costs of piracy are listed, we know only that any other country must have a cost less than $1.9 billion. Country Relative Frequency United States 37.1% China 35.5% India 11.0% France 8.6% United Kingdom 7.8% 29. It is very similar to Table 2-2. Both frequency distributions begin with a low frequency in the first class, followed by the maximum frequency in the second class, and the frequencies are generally lower as you progress from top to bottom in the table. (TI data: Frequencies are 79, 148, 157, 43, 49, 6, 9, 0, 0, 9.) Daily Commute Time in Los Angeles (minutes) Frequency 0–14 157 15–29 324 30–44 282 45–59 103 60–74 98 75–89 7 90–104 18 105–119 0 120–134 0 135–149 11 31. Yes, the frequency distribution appears to be a normal distribution. Systolic Blood Pressure (mm Hg) Frequency 80–99 11 100–119 116 120–139 131 140–159 34 160–179 7 180–199 1 33. Yes, the frequency distribution appears to be a normal distribution. Magnitude Frequency 1.00–1.49 19 1.50–1.99 97 2.00–2.49 187 2.50–2.99 147 3.00–3.49 100 3.50–3.99 38 4.00–4.49 8 4.50–4.99 4
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