Q. How confident can I be that (fill in the blank)?

A. With enough research, a good design, and a controlled process, I can be pretty confident. But this…

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Q: Can I infer something about a population or process based on a point estimate?

A: It is risky to use a point estimate based on a single sample of data to infer something about a…

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Q. If there is no information on how results should be interpreted when comparing a test result to a specification limit, should we use the absolute or the rounding method?

A. The…

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Participation in interlaboratory comparison studies is of high importance for laboratories. Accredited laboratories, and many laboratories that provide testing within a regulatory framework, have…

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The use of reference materials in the laboratory is widespread. These materials are most often used as control samples for control charting, drift correction, second-source…

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Q. What are the basic concepts of measurement?

A. ASTM International members have a broad range of backgrounds, which are necessary for their individual fields. However, not everyone may…

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The Poisson distribution is one of the most important distributions in all of statistics. It is a discrete distribution and counts certain types of events in time or…

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Q: How can probabiity of detection (POD) be estimated for a given target size using find/no-find data from a nondestructive testing (NDT) system?

A: In the…

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When I received my undergraduate degree in chemistry, I never expected to use statistics to the degree I do today. My first career job was in a quality lab for a pharmaceutical manufacturer. I…

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Q. In which other situations does the alpha risk of multiple tests need to be controlled?

A. Click 

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