7 Control Charts for Attributes

CHAPTER OUTLINE

7.1   INTRODUCTION

7.2   THE CONTROL CHART FOR FRACTION NONCONFORMING

7.2.1   Development and Operation of the Control Chart

7.2.2   Variable Sample Size

7.2.3   Applications in Transactional and Service Businesses

7.2.4   The Operating-Characteristic Function and Average Run Length Calculations

7.3   CONTROL CHARTS FOR NONCONFORMITIES (DEFECTS)

7.3.1   Procedures with Constant Sample Size

7.3.2   Procedures with Variable Sample Size

7.3.3   Demerit Systems

7.3.4   The Operating-Characteristic Function

7.3.5   Dealing with Low Defect Levels

7.3.6   Nonmanufacturing Applications

7.4   CHOICE BETWEEN ATTRIBUTES AND VARIABLES CONTROL CHARTS

7.5   GUIDELINES FOR IMPLEMENTING CONTROL CHARTS

Supplemental Material for Chapter 7

S7.1   Probability Limits on Control Charts

The supplemental material is on the textbook Website, www.wiley.com/college/montgomery.

CHAPTER OVERVIEW AND LEARNING OBJECTIVES

Many quality characteristics cannot be conveniently represented numerically. In such cases, we usually classify each item inspected as either conforming or nonconforming to the specifications on that quality characteristic. The terminology defective or nondefective is often used to identify these two classifications of product. More recently, the terminology conforming and nonconforming has become relatively standard. Quality characteristics of this type are called attributes. Some examples of quality characteristics that are attributes are the ...

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