The Essentials of Statistics: A Tool for Social Research
The Essentials of Statistics: A Tool for Social Research
4th Edition
ISBN: 9781305802698
Author: Joseph F. Healey
Publisher: Cengage Learning US
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Chapter 4, Problem 4.13P

S O C Listed here are the rates of abortion per 100,000 women for 20 states in 1973 and 1975. Compute the median, mean, standard deviation, range and interquartile range for both years. Describe what happened to these distributions over the two-year period. Did the average rate increase or decrease? What happened to the dispersion of this distribution? Did the measures of dispersion increase or decrease? What happened between 1973 and 1975 that might explain these changes in central tendency and dispersion? (HINT: It was a Supreme Court decision.)

State 1973 1975
1 Mississippi 0.2 0.6
2 Arkansas 2.9 6.3
3 Montana 3.1 9.9
4 Maine 3.5 9.5
5 South California 3.8 10.3
6 Tennessee 4.2 19.2
7 Texas 6.8 19.1
8 Arizona 6.9 15.8
9 Ohio 7.3 17.9
10 Nebraska 7.3 14.3
11 Virginia 7.8 18.0
12 Iowa 8.8 14.7
13 Massachusetts 10.0 25.7
14 Pennsylvania 12.1 18.5
15 Colorado 14.4 24.6
16 Florida 15.8 30.5
71 Michigan 18.7 20.3
18 Hawaii 26.3 31.6
19 California 30.8 33.6
20 New York 53.5 40.7

Source: U.S. Bureau of the Census. 1977. Statistical Abstract of the United States: 1977. Washington, DC: Government Printing Office, 1977.

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