95 Percent Confidence Interval (Two Standard Deviations) Relative to Sample Size(n) and Population Estimate(p) -------------------------- Population Estimate(p) --------------------------- 10% 20% 30% 40% 50% 60% 70% 80% 90% Sample Points 10 20.0% 26.7% 30.6% 32.7% 33.3% 32.7% 30.6% 26.7% 20.0% 25 12.2% 16.3% 18.7% 20.0% 20.4% 20.0% 18.7% 16.3% 12.2% 50 8.6% 11.4% 13.1% 14.0% 14.3% 14.0% 13.1% 11.4% 8.6% 100 6.0% 8.0% 9.2% 9.8% 10.1% 9.8% 9.2% 8.0% 6.0% 200 4.3% 5.7% 6.5% 6.9% 7.1% 6.9% 6.5% 5.7% 4.3% 400 3.0% 4.0% 4.6% 4.9% 5.0% 4.9% 4.6% 4.0% 3.0%