21. The coefficient of variation forAction A is: A) 12.8% B) 33.3% C) 133.33% D)
ID: 2915818 • Letter: 2
Question
21.
The coefficient of variation forAction A is:
A) 12.8%
B) 33.3%
C) 133.33%
D) 333.33%
22.
Theprincipal focus of the control chart is the attempt to separatespecial or assignable causes of variation from common causes ofvariation. What cause of variation can be reduced only by changingthe system?
A) Special or assignablecauses
B) Common causes
C) Total causes
D) None of the above
23.
Variationsignaled by individual fluctuations or patterns in the data iscalled:
A) special or assignablecauses.
B) common or chance causes.
C) explained variation.
D) the standarddeviation.
24.
Which ofthe following is a moral of the red bead experiment?
A) Variation is part of theprocess.
B) Only management can changethe system.
C) It is the system thatprimarily determines performance.
D) All of the above.
25.
Which ofthe following situations suggests a process that appears to beoperating in a state of statistical control?
event probability Action A Action B 1 0.5 400 700 2 0.5 200 500Explanation / Answer
CV = stdev / mean mean = 400*.5 + 200*.5 = 300 stdev = sqrt(1/2 * ((400 - 300)^2 + (200 - 300)^2)) = sqrt( 1/2 *(100^2 + 100^2) ) = 100 CV = 100 / 300 = 1/3 = 33.3%
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