Number of defects - control chart, Operation Management

Number of Defects - Control Chart

Sometimes the attribute of concern is the number of defects (c) in an item rather than the number of defective items in a sample: for example, the number of flaws per square metre of cloth. In this situation the concept of counting non-defects, for comparison with the number of defects found, is meaningless. Such a process typically conforms to the Poisson distribution, of mean value ¯c and standard deviation √ (¯c) and the control limits are determined as:

Warning limits = ¯c ± 1.96 √ (¯c)  

Action limits = ¯c ± 3.09 √ (¯c)

Posted Date: 3/16/2013 1:57:37 AM | Location : United States







Related Discussions:- Number of defects - control chart, Assignment Help, Ask Question on Number of defects - control chart, Get Answer, Expert's Help, Number of defects - control chart Discussions

Write discussion on Number of defects - control chart
Your posts are moderated
Related Questions
1. Describe how you think the hotel's management will: (a) make sure that the way it manage the hotel is appropriate to the way it competes for business; (b) implement any change i

Benchmarking - Performance and Productivity Measures Benchmarking is the practice of comparing business practice and in particular performance between companies. It has become

Assume that you own a very upscale restaurant (think shearwater at the hotel Del Coronado or the grant grill at the us grant hotel). Business has fallen off greatly at your restaur

Rose  considers herself  a relatively conservative investor  and  the  score  from her investor profile questionnaire categorizes her as an "income and moderate growth" investor. S

Compare the skills of an engineer and an engineer manager

1. A workstation must produce 400 units an hour. It takes 24 minutes to receive the necessary material for production from the previous workstation. Output is moved between worksta

Describe the importance of learning curves in a services-based operation and how they can be used to increase organization efficiency. Please provide a specific example.

A company is considering whether to replace a machine. The old machine costs $90,000 and is being depreciated at 10% per annum using the straight line method. It is written down va

Types of Process Designs The basic type of production system and the finished goods inventory policy to be used must be decided at the earliest stages of process planning. The

Briefly describe your role as an employee of an organization in the IS field. Give examples of what you need to know about information systems and how it can help with your job per