Compare the mean of a continuous measurement in two samples
The sample sizes are calculated in two different ways: first using the T statistic (with a non-centrality parameter), then using the Z statistic. The Z statistic approximates the T statistic, but provides sample sizes that are slightly too small. (We provide the Z statistic calculation to allow comparison with other calculators which use the Z approximation.)
Instructions: Enter parameters in the red cells. Answers will appear in blue below.