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formulas for determining sample size pdf. The formula for the sample size required to compare two population means 0and 1 with common variance 2 is n 2 z1 2z1 2 01 2. Power-based sample size calculations on the other hand relate to hypothesis testing.
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We now consider the issues. Sample Size z2 p 1-p e2 1 z2 p 1-p e2 N N population size. Theoretical aspects formulas.
N Population size Z Critical value of the normal distribution at the required confidence level p Sample proportion e Margin of error.
If you have a small to moderate population and know all of the key values you should use the standard formula. Pointed out that sample size determination is a difficult process to handle and requires the collaboration of a specialist who has good scientific knowledge in the art and practice of medical statistics. If no estimate available set at 50 or 050 q1-p d. Using the computer dialog shown in Figure 1 we find that a sample size of n 23 per group is needed to achieve the stated goals.
