question archive When planning a research study, we need all of the following information to calculate required sample sizeEXCEPT :  A

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. 

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