Sample Size for Population Survey


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This function gives you the minimum number of subjects that you require for a survey of a population for the proportion of individuals in that population displaying a particular factor, with a specified tolerance (Colton, 1974; Feinstein, 2002).


Information required


Technical validation

The estimated sample size n is calculated, using simple Gaussian theory, as:

- where p is p%/100, d is d%/100, and z is a quantile from the standard normal distribution for a two tailed probability of 1-cc. n is rounded up to the closest integer.



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