Acceptance Sampling by Attributes - Compare

User Defined Plans - Average Total Inspection (ATI)

  

The average total inspection per lot represents the relationship between the quality of the incoming material and the average number of items that need to be inspected, assuming that rejected lots will be 100% inspected.

Example Output

Compare User Defined Plan(s)

 

 Sample  Acceptance    Percent  Probability  Probability

Size(n)   Number(c)  Defective    Accepting    Rejecting    AOQ      ATI

    150          10          2        1.000        0.000  1.988    155.9

    150          10          5        0.868        0.132  4.313   3435.6

 

    200          10          2        0.997        0.003  1.979    262.8

    200          10          5        0.583        0.417  2.892  10539.9

 

    250          10          2        0.987        0.013  1.955    566.7

    250          10          5        0.291        0.709  1.440  17799.6

 

 

 Sample  Acceptance         At Percent

Size(n)   Number(c)   AOQL   Defective

    150          10  4.355       5.369

    200          10  3.254       4.027

    250          10  2.595       3.222

 

Accept lot if defective items in n sampled ≤ c;  Otherwise reject.

Interpretation

For the grocery bags, when the average incoming quality level is 2%, the average number of bags inspected per lot is 155.9, 262.8, and 566.7, when the sample sizes are 150, 200, and 250 and the accept number is 10. When the average incoming quality level is 5%, the average outgoing quality 3435.6, 10539.9, and 17799.6, when the sample sizes are 150, 200, and 250 and the accept number is 10.