Sample size to detect a significant difference between 2 means with unequal sample sizes and variances
Enter Mean in population 1
Enter Variance in population 1
Enter Mean in population 2
Enter Variance in population 2
Select Confidence Interval
80%
90%
95%
99%
Select Desired Power
80%
90%
95%
99%
Enter Ratio of sample sizes (n2/n1)
Use 1 or 2-tailed test
1 tailed
2 tailed
Result
Sample size 1 (n1)
Sample size 2 (n2)
Total sample size (both groups)
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