Sampling by Attributes

Military Standard 105E (ANSI/ASQC Z1.4, ISO 2859) Tables

For a lot of 151 to 280 items, and AQL= 1% , reduced inspection plans are:

The Single sampling procedure is:
Sample 20* items. If the number of non-conforming items is 0 --> accept the lot. 2 or more --> reject the lot.

The Double sampling procedure is:
Step 1:	Sample 13* items. If the number of non-conforming items is 0 --> accept the lot. 2 or more --> reject the lot. Otherwise, continue to step 2.
Step 2:	Sample 13* additional items. If the total number of non-conforming items is 0 or less --> accept the lot. 2 or more --> reject the lot.

Important: This sampling plan will yield valid results only if applied with the Military Standard 105E switching rules.

* Note: If the sample size(s) exceeds the lot size, apply 100% sampling of the lot.

OC Curve	ASN Curve

The OC curve describes the probability of accepting a lot, OC(p), as a function of the proportion non-conforming (p), for the single and double sampling plans described above.	The ASN curve describes the average sample size, when employing the double sampling, as a function of the proportion of non-conforming items (p).