In estimating a population proportion, the factors that are needed to determine the required sample size are the confidence level, the margin of error and some idea of what the population proportion is.

Question

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The required sample size for estimating a population proportion is determined by the desired confidence level (which affects the width of the confidence interval), the margin of error (which is half the width of the confidence interval), and an estimate of the population proportion (p-hat), which affects the variability or standard error of the proportion.

In Estimating a Population Proportion, the Factors That Are Needed