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12 <br /> <br /> MINIMUM DIFFERENCE IN PERCENTAGE POINTS REQUIRED FOR <br /> STATISTICAL SIGNIFICANCE IN COMPARISON OF REPORTED <br /> PERCENTAGES FOR SUBGROUPS WITH 95% CONFIDENCE <br /> <br />Subsample 50 100 150 200 250 300 350 400 450 500 600 <br />50 20% 17% 16% 15% 15% 15% 15% 15% 15% 15% 15% <br />100 14% 13% 12% 12% 11% 11% 11% 11% 11% 11% <br />150 11% 11% 10% 10% 10% 9% 9% 9% 9% <br />200 10% 9% 9% 9% 8% 8% 8% 8% <br />250 9% 8% 8% 8% 8% 8% 7% <br />300 8% 8% 7% 7% 7% 7% <br />350 7% 7% 7% 7% 6% <br />400 7% 7% 7% 6% <br />450 7% 6% 6% <br />500 6% 6% <br />600 6% <br /> <br /> Minimums are for reported percentages near 50%. When much smaller or much larger <br /> percentages are reported, a slightly smaller minimum is required. <br /> <br /> Advanced Marketing Research, Inc. <br /> <br /> <br />