Sample Size Determination
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Paired Samples: Difference between paired means
This utility can be used to calculate required sample size when your objective is to test the significant difference between two paired means.
Formula used and other details
Your guesstimate of difference between paired Means
Required
Approxiate estimate of difference between two (paired) means based on previous studies / pilot studies etc.
Your guesstimate of Standard Deviation of differenced means
Required
Approxiate estimate of Standard Deviation, based on previous studies / pilot studies etc.
Confidence Level %
Enter positive number between 0.01 to 99.99
Required
In percentage. Commonly used values are 95, 99 and 90. Should be between 0.01 to 99.99.
Power ( 1 - β)
Enter positive number between 0.01 and 99.99
Required
In Percentage. Should be between 0.01 to 99.99. Common values are 80 % and 90 %
One sided or two sided
Enter either 1 or 2
Required
One tailed or two tailed hypothesis
Sample Size Required =