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

question 58

Essay

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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Definitions:

Reject

In statistical testing, to dismiss the null hypothesis based on evidence that supports the alternative hypothesis.

H0

The notation for the null hypothesis in statistical hypothesis testing, representing no effect or no difference.

Reject

In statistical analysis, to refuse the null hypothesis, concluding there is sufficient evidence to support a significant effect or difference.

H0

Stands for the null hypothesis in statistical hypothesis testing, representing the assumption that there is no significant difference or effect.