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

Summary: 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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  • Topics: Sampling
  • Keywords: Sample size, Sampling, Confidence intervals, Tolerance, Range
  • Author: Hamada, M.S.; Kelly, E.; Buxton, T.;
  • Journal: Quality Engineering