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Sample Size Calculator Using Percentage Values
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Sample Size Calculator Using Percentage Values
Number of Samples
ONE
TWO
Test Value (%)
Value to compare the sample percentage to
Sample Percentage (%)
Value measured from sample or expected from 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.
Sample Size
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