Cochran Sample Size Calculator. This calculation is based on the Normal distribution and assumes you have more than about 30 samples. Sampling Techniques 2nd Ed New York.
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Oct 17 2019 I. Where N is the population size r is the fraction of responses that you are interested in and Zc100 is the critical value for the confidence level c. Most of the time p is considered by default 05.
Here n 0 is Cochrans sample size recommendation N is the population size and n is the new adjusted sample size.
A sample of any given size provides more information about a smaller population than a larger one so theres a correction through which the number given by Cochrans formula can be reduced if. In short Cochrans formula is the following. Oct 17 2019 I. Here n 0 is Cochrans sample size recommendation N is the population size and n is the new adjusted sample size.
