Explain when it is best to use a plus four estimate of the population proportion

Statistics
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Explain when it is best to use a plus four estimate of the population proportion.

Nov 29th, 2014

When you want a 95% confidence interval for p and the sample size is fairly small (about 10) then it is best to add 2 successes and 2 failures, increasing n by 4 before calculating the confidence interval

Nov 30th, 2014

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