If σ is unknown and there is no preliminary sample available to estimate σ,the range can be utilized to determine an estimate of σ when finding sample size.

Name: If σ is unknown and there is no preliminary sample available to estimate σ,the range can be utilized to determine an estimate of σ when finding sample size.
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The range can be used to estimate the standard deviation (σ) by dividing it by a constant (often referred to as the range factor) when no preliminary sample is available.

If σ Is Unknown and There Is No Preliminary Sample