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statistics answers to review problems chap3

# statistics answers to review problems chap3 - Homework 2...

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1 Homework 2 answer key 3.1.- The figure below shows a histogram for the heights of a representative sample of men. The shaded area represents the percentage of men whose heights were between ________ and _________. Fill in the blanks. % per 20 inch 10 0 58 60 62 64 66 68 70 72 74 76 78 80 HEIGHT (Inches) 66 inches and 72 inches 3.2.- The distribution by age in the United States in 1991 is shown below. Draw the histogram. (The class intervals include the left endpoint, not the right; for instance, on the second line of the table, 13% of the people were age 5 years or more but had not yet turned 14. The interval for “75 and over” can be ended at 85. Men and women are combined in the data.) Use your histogram to answer the following questions. Age Percent of Population Density =%/class width 0-5 8 1.6 5-14 13 1.44 14-18 5 1.25 18-25 10 1.43 25-30 8 1.6 30-35 9 1.8 35-45 16 1.6 45-55 10 1 55-65 8 0.8 65-75 7 0.7 75- and over 5 0.5

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2 % population per year 1 0 10 20 30 40 50 60 70 80 90 AGE (in years) (a) Are there more children at age 1, or more at age 11? When we draw a density histogram, the area under a block, e.g. under the block corresponding to class interval 0-5 is divided equally among the subintervals within that interval. Based on that, the area corresponding to 1 is larger than the area corresponding to 11 (higher density for 1 than for 11). (b) Are there more 21-year-olds, or more 31-year-olds? More at 31. Density is higher for 31 years old (i.e, percentage of population 31- year-old is higher than percentage population 21-years-old.
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statistics answers to review problems chap3 - Homework 2...

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