When determining the sample size needed to achieve a particular error estimate you need
to know $\sigma$ . What are two methods of estimating $\sigma$ if σ is unknown?

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The Answer of When determining the sample size needed to achieve a particular error estimate you need
to know $\sigma$ . What are two methods of estimating $\sigma$ if σ is unknown?

When Determining the Sample Size Needed to Achieve a Particular σ\sigmaσ

When Determining the Sample Size Needed to Achieve a Particular $\sigma$