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equation for sample size determination. The z-score is the number of standard deviations a given proportion is away from the mean. Table 1 b page 26 shows that in this case the required sample size would be reduced to 173.
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An investigator working for a national programme of immunization seeks to estimate the proportion of children in the country who are receiving appropriate childhood vaccinations. 7 min read How many is enough. Sample size determination haps 90.
S Z2 P Q E2 When you want to identify the sample size for a smaller population the above formula can be modified like below.
Therefore the sample size is an essential factor of any scientific research. And Z a2 is the critical value of the Normal distribution at a2 eg. Sample Size n N Z2 p 1-pe2 N 1 Z2 p 1-pe2. 7 min read How many is enough.
