Standardization News

Q: How do we handle zero defects or non-conformities when sampling a continuum?

A. Click HERE to…

The Intermediate Precision of ASTM International Test Methods

Q: What is the intermediate precision of a test method? How is it measured and used?

Q: ASTM International standard E691, Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method, recommends a particular design, but other ASTM committees suggest…

What Are Z-Scores?

Q: What exactly are z-scores and how are these statistics used in practice?

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Statistical Intervals

Q: What is a confidence interval?

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Testing for Outliers

Q: How can you test for an outlier, and Is there an ASTM standard for this practice?

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Lot Acceptance Procedure Criteria

Q. Lots are released based on comparing test results from a sample to lot acceptance procedure criteria. If a set of test results meets the lot acceptance procedure criterion, how can I be assured…

How Normal Is Normal?

Q. How can I determine if my data comes from a normal distribution?

A. Click HERE to download the…

Assessing crack Detection capability

Q. What statistical procedure is used to determine the typical crack size that can be detected with a given probability?

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GESD – A Robust and Effective Technique for Dealing with Multiple Outliers

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

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