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Oliver 75 - 29th Question

jyotimayank
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Oliver 75 - 29th Question

Postby jyotimayank Mon May 09, 2016 9:16 am

Question 29.

What is defined by control limits?


A. A measuring instrument solely used to describe process capability. The process is found capable if the ±3 sigma range is exceeded by not more than 0.3% of a tested sample lot.

B. The limits of the six sigma area on either side of a control chart to plot measured values; data found outside the area are out of specification and can lead to rejection of an entire batch.

C. The area consisting of typically three standard deviations on either side of a mean value of a control chart to plot measured values found in statistical quality control

D. The area consisting of typically three standard deviations on either side of a mean value of a control chart to plot measured values found in quality assurance
Jyoti Gupta
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Re: Oliver 75 - 29th Question

Postby Ananyapmp Mon May 09, 2016 11:34 am

Its either C or D
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Re: Oliver 75 - 29th Question

Postby jyotimayank Tue May 10, 2016 7:20 am

The correct answer is C.

PMBOK® Guide Fifth Edition defines Control Limits as
The area composed of three standard deviations on either side of the centerline or mean of a normal distribution of data plotted on a control chart, which reflects the expected variation in the data.


Upper and lower control limits are established for the control chart and normally using statistical analysis or from historical records. Data points of a process are plotted to perform trend analysis toward either of control limits and with respect to centre line.
For repetitive process, the control limits are generally set at +_ 3 sigma around a process variable X or process mean i.e. Centre Line. Upper control limit is drawn at 3 standard deviations above the process mean and lower control is drawn at 3 standard deviations below the centre line or process mean.
These limits are established to predict if process needs corrective action to bring process performance in line with needed stability and capability

Data points within +- 3 sigma are thought as “in Control”, and within acceptable limits excluding the rule of seven (described later).
Data points are within +-3 sigma means these data points are not crossing either of control limit. Anything beyond control limit requires investigation.
When 7 consecutive data points are presented on either side of mean, then “process is considered Out Control” based on heuristic of Rule of Seven.

Refer to Page 238-239 0f PMBOK® Guide 5th Edition

For more insight of this topic refer to the following blog

Control Chart as a Component of Seven Basic Quality Tool
http://www.izenbridge.com/blog/control- ... lity-tool/
Jyoti Gupta
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Re: Oliver 75 - 29th Question

Postby Ananyapmp Tue May 10, 2016 10:30 am

Thanks for the detailed explanation

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