Estimate True Proportion Calculator. Your calculator will return the output screen shown to the right. If a normal model is a good fit for the sampling distribution then about 95 of sample proportions estimate the population proportion within 2 standard errors.
We say that we are 95 confident that the following interval contains the population proportion. Sample Size to Estimate a Proportion with Specified Precision. This calculator gives both binomial and normal approximation to the proportion.
Start by entering this data into your calculator as described above.
Inputs are the assumed or estimated value for the proportion the desired level of confidence the desired precision of the estimate and the size of the population for limited population sizes. The formula to calculate the confidence interval is. If the p-value is less than the significance level. This utility calculates the sample size required to estimate a proportion or prevalence with a specified level of confidence and precision.
