As a rule of thumb for the first survey, rough estimation of sample size is computed, e.g. confid... more As a rule of thumb for the first survey, rough estimation of sample size is computed, e.g. confidence level of 95% and confidence interval of 6.7%, and the assumed population size of 3,000, the sample size is 200. The formula used is: Z = Z value (e.g. 1.96 for 95% confidence level) = 1.96 p = percentage picking a choice, expressed as decimal (0.5 used for sample size needed) c = confidence interval, expressed as decimal = 0.067
As a rule of thumb for the first survey, rough estimation of sample size is computed, e.g. confid... more As a rule of thumb for the first survey, rough estimation of sample size is computed, e.g. confidence level of 95% and confidence interval of 6.7%, and the assumed population size of 3,000, the sample size is 200. The formula used is: Z = Z value (e.g. 1.96 for 95% confidence level) = 1.96 p = percentage picking a choice, expressed as decimal (0.5 used for sample size needed) c = confidence interval, expressed as decimal = 0.067
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