High-pressure sales tactics or door-to-door salespeople can be quite offensive. Many people succumb to such tactics, sign a purchase agreement, and later regret their actions. In the mid-1970s, the Federal Trade Commission implemented regulations clarifying and extending the rights of purchasers to cancel such agreements. The accompanying data is a subset of that given in the article "Evaluating the FTC Cooling-Off Rule" (J. of Consumer Affairs, 1977: 101-106). Individual observations are cancellation rates for each of nine sales people during each of 4 years. Use an appropriate test at level .05 to see whether true average cancellation rate depends on the year.

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Salesperson 1973 2.8 5.93.3 4.4 .7 3.8 6.6 3.1 0.0 1974 3.6 1.7 5.1 2.2 2.1 4.1 4.72.7 13 975 14 .9 3.2 8 1.5 2.8 14 5 1976 2.0 2.2 .9 1. 51.2 14 3.5 1.2