# 26: Needed Sample Size for a Confidence Interval for a Population Proportion Calculator


Sample Size Calculator

Fill in the error bound (E) and the confidence level (CL) written as a decimal, for example a 95% confidence level is 0.95.  If there is an estimate for the population proportion, check the "Have Estimate for p" radio button and then fill in the estimate in the p box that appears.  Then hit "Calculate n" and the needed sample size will be calculated for you.

 No Estimate for p Have Estimate for p Estimate for p: E: CL: n:

(Desmos)

Back to the Calculator Menu

26: Needed Sample Size for a Confidence Interval for a Population Proportion Calculator is shared under a CC BY license and was authored, remixed, and/or curated by Larry Green.