Modules in the group Power and Sample Size compute power of a test, required sample size an minimal difference of parameters that can be detected by the test. The tests support normal and binomial distribution. Inputs are significance level (or type I error) α, type of the test (one-sided or two-sided and theoretical (expected, specified) distribution parameter value. This parameter is the mean value for normal distribution, or probability for binomial distribution. Further, it is necessary to specify two of the following three numbers: Sample size, expected sample statistic and the power of the test 1 – β (β is the type II error). This module does not use any data from the data editor.

Tests supported:

- Normal distribution - t-test 1 sample
- Normal distribution - t-test 2 samples
- Binomial distribution - Chi2-test 1 sample
- Binomial distribution - Chi2-test 2 samples

Testing - Pdf manual