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Standardization News

Is It in Spec ... or Not?

Q: Can a product with a single inspection result that is worse than the specification limit by an amount not exceeding reproducibility (R) be considered as being in conformance with the…

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Getting to Know Uncertainty

 

Q: Is estimation of uncertainty required if a laboratory is using a standard ASTM International test method with defined repeatability and reproducibility, and using standard equipment…

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Standard Error Concept

Q: What is a standard error and how is this used in practice?

A. Click …

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Shewhart Individuals Control Charts

Q: How does sample size impact Shewhart individuals control chart reliability?

A. Click…

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What Is the Proper ILS Design?

The Benefits of E691

Q: ASTM International standard E691, Practice for Conducting an Interlaboratory Study to Determine…

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Statistical Intervals, Part 3

Q: What is a tolerance interval?

A. Click HERE to download the full article and read the answer.

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Inspection Redundancy: Part 2

Q: What is the purpose of multiple or redundant inspections?

A. Click HERE to download…

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Combining Results

 

Q. How can I combine the results of two samples that are statistically alike based on hypothesis testing when the original data are now unavailable?

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Precision in ASTM Test Methods

Q: What is precision and how is it interpreted in the context of ASTM test methods?

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GESD

 

Q. I suspect that my data contain more than one outlier. Is there a preferred technique to use to isolate them?

A. Click …

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