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12 <br /> MINIMUM DIFFERENCE IN PERCENTAGE POINTS REQUIRED FOR <br /> STATISTICAL SIGNIFICANCE IN COMPARISON OF REPORTED <br /> PERCENTAGES FOR SUBGROUPS WITH 95% CONFIDENCE <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 /> Minimums are for reported percentages near 50 %. When much smaller or much larger <br /> percentages are reported, a slightly smaller minimum is required. <br /> Advanced Marketing Research, Ina <br />