G* power is a free statistical software that allows the user to determine the sample size needed based on a wide variety of tests.
Fundamentals of estimating sample size
Power Analysis: Determining Sample Size for Quantitative Studies
How To Determine Sample Size From G*Power, 43% OFF
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Calculating Sample Size: Cohen's Tables and G. Power - ppt download
Calculate Sample Size (A Priori) using G-power
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How to Calculate Sample Size Needed for Power - Statistics By Jim
