Significance, Errors, Power, and Sample Size the Blocking ...
in calculating the needed study sample size will be explored below.23 However, when computing the observed effect size, the sample size is not included in the calculation.18,20 For example, Cohen’s d is calculated as the difference between the 2 sample means divided by the pooled standard devia-tion (SD) for all the data in the 2 independent samples. It is thus the difference in means in SD ... ................
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