PQ Systems - Quality eLine
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Assuring security of medical data demands quality control

Quality Quiz: With a video!

Data in everyday life

Six Sigma and more

Bytes and pieces

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Quality Quiz:Professor Cleary
Another quiz from Professor Cleary

Anna Notherthing, quality assurance czar for Melt and Mold Industries, Inc., a plastics extrusion company in the Midwest, is serious about control charts. She sees data analysis and process control as ways not only to assure high quality products for M&M, but also to enhance her own career. She personally instructs each new employee in her department, giving them a solid foundation in the fundamentals of SPC. Anna has given the same attention to Jan U. Wari, who also aspires to advancement in the organization, and has emphasized the importance of keeping all process data points between the upper and lower control limits. 

Jan U. Wari is assigned to monitor a series of machines that extrude raw materials used for manufacturing parts for toys. One of these machines, she believes, is not operating with the same consistency that others on the line demonstrate. Since she had some fleeting experience as an operator prior to being hired by Anna Notherthing, she feels confident that by adjusting the operation of the machine she can reduce the variability of the process. The operator advises her not to tamper with the machine, since this can contribute to variability in the process, but she says that she knows what she's doing.

Jan is using an individuals moving range chart. She decides to adopt a decision rule: if a point falls above X-bar, she will adjust the operation of the machine downward to compensate for the distance between the data point and X-bar. If a data point falls below X-bar, on the other hand, she would adjust the operation upward to compensate.

If Jan follows this decision rule, which of the following will be true?

a) Variability of the process will decrease

b) Variability of the process will increase

c) Variability will remain the same


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