Determining The Sample Size Necessary To Estimate A Population Proportion. This calculator uses the following formula for the sample size n. Standard Deviation оа O 2012 O Margin of Error.
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Best Answer Previous question Next question. The estimated minimum sample size n needed to estimate a population proportion p to within E at 100 1 α confidence is n z α 2 2 p 1 p E 2 rounded u p There is a dilemma here. Where z 1645 E 03 assume p 5 because this maximizes p 1-p and we want a safe estimate.
Standard Deviation оа O 2012 O Margin of Error.
Q 1 p 1 0842 0158 Since CL 095 then α 1 CL 1 095 005 α 0025. Choose the required confidence level from the dropdown menu Input the margin of error Input the proportion of the total population. Plugging in everything we obtain. Please select type the the significance level alpha and the required margin of error E along with an estimate of the population proportion if one exists and the solver will find the minimum sample size required.
