Square-yard pieces of carpet

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A textile manufacturer wants to set up a control chart for irregularities per 100 square yards of carpet. The following data were collected from a sample of twenty 100-square-yard pieces of carpet:

Sample :           1 2   3 4   5 6 7   8 9    10

Irregularities : 11 8 9 12 4 16 5 8 17 10

Sample :         11 12 13 14 15 16 17 18 19 20

Irregulaties:     11   5    7   12 13   8 19   11  9   10

a) Using these data, set up a c-chart with z= 3.

b) Suppose that the next five samples had 15, 18, 12, 22, and 21 irregularities. What do you conclude?

Reference no: EM13901643

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