Comparisons Among Several Samples (Analysis of Variance ...

Piface Options for the Two Sample T-Test with Pooled Standard Deviation. (This information is entered into the dialog box shown below.) Standard Deviation (sigma) This dialog provides for power analysis of a two-sample t-test. If the "equal SDs" box is checked, then the pooled t test is used. This is the option you will usually use. ................
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