Finding
where zα/2 corresponds to the confidence level and d is the decimal form of the percentage error. For example, to be 95% confident that s is within 15% of the value of σ, use zα/2 = 1.96 and d = 0.15 to get a sample size of n = 86. Find the sample size required to estimate σ, assuming that we want 98% confidence that s is within 15% of σ.
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