question archive When planning a research study, we need all of the following information to calculate required sample sizeEXCEPT : A
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When planning a research study, we need all of the following information to calculate required sample sizeEXCEPT :
A.the level of significance.
B.the study power we plan to achieve.
C.if a group randomization will be performed or not.
D.the effect size or group means and standard deviation from the pilot data.