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9.4: Sample Size Considerations
https://stats.libretexts.org/Courses/Fresno_City_College/Math_11%3A_Elementary_Statistics/09%3A_Two-Sample_Problems/9.04%3A_Sample_Size_Considerations
The minimum equal sample sizes needed to obtain a confidence interval for the difference in two population proportions with a given maximum error of the estimate and a given level of confidence can al...The minimum equal sample sizes needed to obtain a confidence interval for the difference in two population proportions with a given maximum error of the estimate and a given level of confidence can always be estimated. If there is prior knowledge of the population proportions p1 and p2 then the estimate can be sharpened.

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