Standardization News

The Intermediate Precision of ASTM International Test Methods
Q: What is the intermediate precision of a test method? How is it measured and used?A. Click HERE to download the article and read the answer. 
What Is the Proper ASTM ILS Design?
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... read more
What Are Z-Scores?
Q: What exactly are z-scores and how are these statistics used in practice?A. Click HERE to download the article and read the answer. 
Statistical Intervals
Q: What is a confidence interval?A. Click HERE to download the article and read the answer. 
Testing for Outliers
Q: How can you test for an outlier, and Is there an ASTM standard for this practice?A. Click HERE to download the article and read the answer. 
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... read more
How Normal Is Normal?
Q. How can I determine if my data comes from a normal distribution?A. Click HERE to download the full article and read the answer. 
Assessing crack Detection capability
Q. What statistical procedure is used to determine the typical crack size that can be detected with a given probability?A. Click HERE to download the full article and read the answer.
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?Click HERE to download the full article and read the answer.Editor’s Note:... read more
Testing for Non-Inferiority
Q. What is non-inferiority, and how is this related to equivalence in comparing two sets of test results?A. Click HERE to download the full article and read the answer. 

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