Vol. 10, No. 6

June 2008

PQ Systems
 
Contents

Spring cleaning and
inactive gages

Quality Quiz: With a video!

Data in everyday life

MSA with Jackie Graham

Bytes and pieces

FYI: Current releases

 

Send Quality eLine
to a friend!

Just type in your friend's email below:

 

Sign up
If you received this newsletter from a friend and want your own subscription to Quality eLine, click below.

Subscribe to Quality eLine

 
Software

 

   

Quality Quiz from Professor Cleary

Congratulations:
"B" is correct.

Click here for a more complete video explanation

Karmond Geeya, by disregarding one of the essential assumptions, is rendering the use of c-charts invalid. All of the four assumptions must be met. These assumptions are:

  1. The occurrences of a defect type are discrete;
  2. The area of opportunity (motor) is well defined;
  3. The occurrence of one type of defect is not influenced by the occurrence of another type;
  4. The probability of any one type of defect occurring is small.

Although assumption #3 is somewhat subjective, Geeya is incorrect in disregarding it. Without all four assumptions in place, she will produce an inaccurate (possibly poisonous) chart.

Below is an example of a c-chart that has met all of the conditions outlined in the four assumptions.


Click to enlarge

 

Click here to register to win a free Quality Gamebox program.

 

Copyright 2008 PQ Systems.
Please direct questions or problems regarding this web site to the Webmaster.