Statistical Quality Control

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Describe three recent situations in which you were directly affected by poor product or service quality. What might have been the cause and how might statistical quality control help eliminate these situations?

Jul 10th, 2015

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I purchased a bag of flour that I did not open right away.  I placed in it the kitchen cabinet.  Weeks later, I found bugs in many food items in the cabinet.   When I examined the bag of flour, I found dead bugs in the glued seal and inside the bag.  Because of the infestation, I had to throw out a number of food items from the cabinet.  I also had to treat the kitchen with a compound that would get rid of the remaining bugs.

I did not notice that the bag of sliced beef was expired when I purchased it from a grocery store.  A few days later, I opened it and ate some beef.  Within an hour, I became very sick.  I then looked at the package only to determine that it had expired 3 weeks earlier!  I was very upset.  I do accept some responsibility in that I did not always check expiration dates on items I purchased.  However, that package should not have been available for sale.  I now check expiration dates every time.  In addition, when I went to another facility of the same grocery store, I found that every package of sliced beef for sale was expired by at least a week.  So I took all of the packages of beef up to the help desk to give them to a manager and complain.  He apologized saying that he would deal with the problem.

So, the electronic equipment, at the lowest possible cost hastened the use of statistical

sampling and quality control charts. Since World War II these statistical techniques have been refined and sharpened. In recent years companies have been motivated to improve quality by the challenge

of being recognized for their quality achievements. U.S. companies that demonstrate excellence in quality achievement and management. The award categories include manufacturing, service, and small business.

What is quality? 

There is no commonly agreed upon definition of quality. To cite a few diverse definitions: From Westinghouse, “Total quality is performance leadership in meeting the customer requirements by doing the right things right the first time.”

 “Quality is meeting customer expectations.”  

W. Tuchman says, 

“Quality is achieving or reaching the highest standard as against being satisfied with the sloppy or fraudulent.

So, the Quality Control (QC) is a system of routine technical activities, to measure and control the quality

of the inventory as it is being developed. The QC system is designed to:

 Provide routine and consistent checks to ensure data integrity, correctness, and completeness;

  Identify and address errors and omissions;

    Document and archive inventory material and record all QC activities

QC activities include general methods such as accuracy checks on data acquisition and

calculations and the use of approved standardised procedures for emission calculations,

measurements, estimating uncertainties, archiving information and reporting. Higher tier QC

activities include technical reviews of source categories, activity and emission factor data, and methods.

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Jul 10th, 2015

Jul 10th, 2015
Jul 10th, 2015
Oct 24th, 2016
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