October 2012
Beginner
420 pages
9h 37m
English
book
Industrial Statistics with Minitab
by Pere Grima Cintas, Lluis Marco Almagro, Xavier Tort-Martorell Llabres
Content preview from Industrial Statistics with Minitab
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20.4 Plotting the Number of Defective Units (NP)
Using data in file CATHETER.MTW, proceed to construct a NP chart as follows.
Stat > Control Charts > Attributes Charts > NP
Using the default options one obtains:
One point lies above the upper control limit. A special cause was found for this unusual increase in the number of defective catheters (a defective lot of raw material), making it reasonable to recalculate the control limits after removing such a singular point.
After the recalculation, as expected, the upper control limit is now slightly smaller.
Although Minitab allows the use of variable sample sizes when constructing NP charts, that is not appropriate. The best practice to facilitate NP charts interpretation is to use a constant sample size, whenever possible. If a constant sample size cannot be used, it is better to draw a P chart instead.
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