Question

A company wishes to use ANSI/ASQ Z1.4 for the inspection of their incoming purchased parts. Each shipment contains 600 parts. If the company wishes to use an AOQ = 2.5% then fill in the missing values below: The Code Letter is: The Sample Size is: The Acceptance Number is: The Rejection Number is:

Clearly and completely explain how the above acceptance sampling plan would be implemented and used on a regular basis.

Answer 1

solution:

Given: Lot size=600 and AOQ=2.5%

a)

Step 1: Finding the code letter.

GII is the General inspection levels chosen to select the sample size code letter.

We can find the sample size code letter from the below table under GII section.

So, code letter is 'H' from the above table.

Step 2: Finding the sample size, acceptance number and rejection number.

Let us find the sample size, acceptance number and rejection number from the below table.

For code 'H',look at the black highlighted part in the below table.

So, sample size=50, sample size=3 and rejection number=4.

b)

The following are the steps involved in implementation of the acceptance sampling plan.

Step 1: We draw a random sample of size n from the lot received from the supplier or the final assembly.

Step 2: We inspect each and every unit of the sample and classify it as defective or non-defective on the basis of certain criteria. At the end of the inspection, we count the number of defective units found in the sample.

Step 3: We compare the number of defective units found in the sample with the acceptance criteria.

Step 4: If the acceptance criteria are satisfied, we accept the entire lot. Otherwise, we reject the entire lot.

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