Listed here are the rates of abortion per 100,000 women for 20 states in 1973 and 1975.

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? 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 Maine 3.5 9.5 Massachusetts 10.0 25.7 New York 53.5 40.7 Pennsylvania 12.1 18.5 Ohio 7.3 17.9 Michigan 18.7 20.3 Iowa 8.8 14.7 Nebrask 7.3 14.3 Virginig 7.8 18.0 South Carolina 3.8 10.3 Florida 15.8 30.5 Tennessee 4.2 19.2 Mississippi 0.2 0.6 Arkansas 2.9 6.3 Texas 6.8 19.1 Montana 3.1 9.9 Colorado 14.4 24.6 Arizona 6.9 15.8 California 30.8 33.6 Hawaii 26.3 31.6 Source: United States Bureau of the Census, Statistical Abstracts of the United States: 1977 (98th edition). Washington, D.C., 1977.