A shirt manufacturer buys cloth by the 100 yard roll from a supplier. For setting up...

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Answer 1

Answer #1

(a)

Calculate average irregularities.

C=- Total irregularities_47 Sample size 10

Sp= Ve= 4.7 = 2.16794 = 2.17

UCL = c+277= 4.7 + 2(2.17) = 4.7 + 4.34 = 9.04

LCL = = - 24% = 4.7 – 2(2.17) = 47 – 4.34 = 0.36

(b)

The next five observations fall in the control limits. So the process is under control.

Answer: Yes

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Answer 2

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