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Control Charts

17 Pages
112 Views

Department
Quantitative Methods
Course Code
QMS 102
Professor
Clare Chua

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Business Statistics I Dr. Changping Wang
Chapter 9 – Statistical Application in
Quality Management
Question: How do we make use of the statistics (
X
and S) concepts to control quality?
1) The Statistical Process Control ( SPC )
~ 1 ~
Business Statistics I Dr. Changping Wang
SPC involves the use of statistical methods to
monitor processes to ensure process is making
product to standard.
To monitor production processes where a certain
product is being produced for a relatively long period
of time
Today SPC can be used to monitor service
processes
1)Delivering luggage in a hotel;
2)Operators spend on phone processing
customers’ orders;
3) Cleaning and preparing for rooms in a hotel;
4)Passport Canada.
One of the more popular elements of SPC involves
the use of Control Charts.
All processes are subject to variability.
~ 2 ~
Business Statistics I Dr. Changping Wang
Type of variability
(a) Chance/Common causes/ Noise/Natural
Pattern (Random Variations)
1)Inappropriate Procedures;
2)Poor design;
3)Poor maintenance of machines;
4) Poor working conditions, e.g. lighting, noise,
dirt, temperature, etc.
5)Normal wear and tear
(b) Special/Assignable causes/Signal/Unnatural
Pattern (Correctable problems)
1)Poor adjustment of equipment;
2)Operator falls asleep; absent;
3) Machine malfunction;
4) Unskilled workers;
5)Computer crashes;
6) Poor batch of raw material; etc
Objective: Identify assignable causes.
2) The Process Control Charts
~ 3 ~

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Description
Business Statistics I Dr Changping WangChapter 9Statistical Application in Quality ManagementXQuestion How do we make use of the statisticsand S concepts to control quality1The Statistical Process ControlSPC1 Business Statistics I Dr Changping Wang SPC involves the use of statistical methods to monitor processes to ensure process is making product to standard To monitor production processes where a certain product is being produced for a relatively long period of time Today SPC can be used to monitor service processes1Delivering luggage in a hotel 2Operators spend on phone processing customers orders 3Cleaning and preparing for rooms in a hotel4Passport Canada One of the more popular elements of SPC involves the use of Control ChartsAll processes are subject to variability 2
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