Cochran Formula Calculator Online. Identifying the symbols in the formula with actual figures. Always available when you need it.
If you ask a random sample of 10. One hundred people are asked to rate four different drug formulations as effective or not for hay fever. More calculators will be added soon - as well as many new great features.
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When gathering market research data use the calculator to achieve a large enough sample size. Study as much feedback as. 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. Cell E24 contains the value for N.
