Question

1. Carpet is packaged in 100-yard rolls.  Quality control team opens five rolls every day to check problems like inconsistency in pattern or color, stains, and other potential defects.  These problems are counted and reported as number of problems found per roll.  The following table shows number of problems found in one day:

Sample	# of problems
1	5
2	2
3	4
4	3
5	1

What you can say about the process?

1. This process is not in statistical control because upper control limit is smaller than 9
2. This process is not in statistical control and upper control limit is greater than 6
3. This process is in statistical control and upper control limit is greater than 7
4. This process is in statistical control and lower control limit is larger than 0.002

Answer 1

Solution:

Using the given sample we calculate x bar control chart for given sample observation using mintab statistical software as below

Then our question is What you can say about the process? now using the above control chart we give the answer for this question is ,

Ans : C. This process is in statistical control and upper control limit is greater than 7

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