Power and Sample Size Calculation - Purdue University

Test for One Standard Deviation. Sample Target. Ratio Size Power Actual Power. 0.8 90 0.9 0.901976. A 90 part sample must be produced and tested to determine a 20% reduction of Standard Deviation, provided that such improvement took place. The test power of .9 means that there is 90% chance that the collected sample will feature parts with ... ................
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