Acceptance Sampling

In Quality Control

CONTENTS

Introduction of Acceptance Sampling in Quality Control.

Single and Double Sampling Plans with OC Curves.

Risk of OC Curves:- Consumers risk and Producers risk.

Acceptance sampling is a method used to accept or reject product based on random sample of the product.

A company cannot test every one of its products due to either ruining the products, or the volume of products being too large.

The purpose of acceptance sampling is to accept or reject lots rather than to estimate the quality of a lot.

This process allows a company to measure the quality of a batch with a specified degree of statistical certainty without having to test every unit of product.

Sampling PlansSingle Sampling Plan:- When a

decision on acceptance or rejection of the lot is made on the basis of only one sample, acceptance plan is known as Single Sampling Plan.

Double Sampling Plan:- When a decision on acceptance or rejection of the lot is based on the basis of two samples, then acceptance plan is known as Double Sampling Plan.

OC Curve

AQL :- Acceptance Quality Level.LTPD :- Lot Tolerance Percentage Defective.IQL :- Indifference Quality Level.

OC Curve

0

0.2

0.4

0.6

0.8

1

1.2

P

Prob

abili

ty o

f Acc

epta

nce

LTPDAQL

Producers Risk

Consumers Risk

Risk Of OC CurveProducer’s Risk :- Producer's risk is the

probability that a good product will be rejected as a bad product by the consumer.

Consumer’s Risk:- Consumer's risk is a potential risk found in all consumer-oriented products, that a product not meeting quality standards will pass undetected though the manufacturer's quality controls system and enter the consumer marketplace.

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