Q. What is nonconstant variance and why is it a concern when model fitting?
For the answer,…
read moreInterested in learning more about rounding fractions? In the September/October 2024 installment of Data Points…
read moreQ. Why am I getting so many out-of-control signals?
A. There are multiple possibilities that may provide a larger number of out-of-control (OOC) signals than can be reasonably…
read moreQ: I have a difficult data set that I want to use to help solve a problem. I am finding it difficult to find something of potential value. Can you help?
A: Difficult…
read moreQ. 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…
read moreQ: 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…
read moreQ. 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…
read moreParticipation in interlaboratory comparison studies is of high importance for laboratories. Accredited laboratories, and many laboratories that provide testing within a regulatory framework, have…
read moreThe 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…
read moreQ. 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…
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