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What is the value of r

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Problem -

Auto pistons at Wemming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows:

Day

Mean (mm)

Range (mm)

1

156.9

4.2

2

153.2

4.6

3

153.6

4.1

4

153.5

5.0

5

156.6

4.5

a) What is the value of x?

b) What is the value of R?

c) What are the UCLx and LCLx , using 3s? Plot the data.

d) What are the UCLR and LCLR, using 3s? Plot the data.

e) If the true diameter mean should be 155 mm and you want this as your center (nominal) line, what are the new UCLx and LCLx.

Reference no: EM131358802

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