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Sample Size Calculator Using Average Values
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Sample Size Calculator Using Average Values
Number of Samples
ONE
TWO
Test Value
Value to compare the sample average to
Sample Average
Value measured from sample or expected from sample
Standard Deviation for Sample
Standard Deviation for Sample 2
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 average values. An Alpha of 5% 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 average values — assuming no when a real difference exists. A Beta of 50% is used in most simple calculations of sampling error.
Sample Size
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