ASTM E122 updated for calculating sample size

ASTM E122, Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process, has just been revised.  The new 2017 Edition updates the previous 2009 Edition (with an editorial correction), which is now obsolete.  The standard covers a number of simple methods for calculating unit values for valid sampling.  ASTM E122 is one of our all-time best-selling sampling and process control standards!

Sampling is a proven methodology used extensively in quality and process control.  In order to have valid results, you need to understand how many units need to be used in order to achieve a specified precision.  And accuracy depends both on the units chosen and the time interval.  This practice was developed so you have the tools to measure variability.

It’s been a while since the ASTM E122 was revised.  You’ll find corrections in a number of areas.  First, the scope paragraph is expanded to include information on the system of units for the standard.  Also, a disclaimer assures the user that the standard was developed in accordance with standardization principles accepted by the WTO Technical Barriers to Trade Committee.

A new definition of pooled standard deviation has been included.  A number of equations have been changed.  At the end of the publication, a new clause 12 for keywords has been added.

If you want to have more information on these changes, you should purchase the redline edition of the document from us.  With this option, we provide you with both a clean copy of the 2017 Edition plus a marked-up copy of the 2009 so you can clearly see each modification.  Just go to the Document Center Inc. webstore at www.document-center.com.  Here is a link directly to the order page for ASTM E122.

When you place your order, request the redline in the order comments area.  It will cost you 20% more and save you a lot of time and headaches!

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