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Use these free online calculators to estimate the needed sample size for a straightforward one- or two-group study. The methods referenced in these…
These resources explain the concepts of power and sample size and what they depend on.
These resources provide guidance on how to find and work with a biostatistician.  
These resources provide guidance on collecting and managing study data.  
These resources explain the concepts involved in carrying out hypothesis tests and correctly interpreting the resulting p-values.  
These resources explain the key concepts involved in designing, evaluating and interpreting the results of diagnostic tests: sensitivity, specificity…