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Understanding the Rule of 7: Statistical Properties for Various Sample Sizes
Journal article   Peer reviewed

Understanding the Rule of 7: Statistical Properties for Various Sample Sizes

M. S. Hamada, E. Kelly and T. Buxton
Quality engineering, Vol.26(3), pp.285-289
07/03/2014
DOI: https://doi.org/10.1080/08982112.2013.805780

Abstract and subjects

confidence interval coverage probability range relative length distribution tolerance interval
Motivated by an engineer's question to understand the "Rule of 7" sample size rule of thumb, this article studies the statistical properties for a sample size of 7 and well as other sample sizes. Properties of ranges, tolerance intervals and confidence intervals, are considered. Sample size recommendations are made.

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