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print friendly   Averages, One Sample  |  Averages, Two Samples  |  Percentages, One Sample  |  Percentages, Two Samples Two Samples Using Percentage Values Sample 1 Percentage (%):  (Value measured from Sample 1 or expected from this sample) Sample 2 Percentage (%):  (Value measured from Sample 2 or expected from this sample) Alpha Error Level or Confidence Level:  1% 2% 2.5% 3% 4% 5% 7.5% 10% 15% 20% (Probability of incorrectly rejecting the null hypothesis that there is no difference in the percentage values). An Alpha of 5% corresponds to a 95% Confidence Interval. Beta Error Level or Statistical Power [1 - Beta]:  1% 2% 3% 4% 5% 7.5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% (Probability of incorrectly failing to reject the null hypothesis that there is NO difference in the percentage values -- assuming no difference when a real difference exists). A Beta of 50% is used in most simple calculations of sampling error.

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