Five Samples of Size 4 Were Taken from a Process

question 90

Multiple Choice

Five samples of size 4 were taken from a process.A range chart was developed that had LCLR = 0 and UCLR = 2.50.Similarly,an average chart was developed with the average range from the five samples,with = 15.0 and = 24.0.The ranges for each of the five samples were 1.75,2.42,2.75,2.04,and 2.80,respectively.The values of the sample average for each sample were 19.5,22.3,17.4,20.1,and 18.9,respectively.What can you tell management from this analysis?

• A)The process variability is out of control,and we cannot make a statement about the process average.
• B)The process variability is out of control,but the process average is in control.
• C)The process variability and the process average are out of control.
• D)We cannot tell if the process variability or the process average is out of control.

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