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  3. 1.         (a) using a nor

1.         (a) Using a normal distribution, define what is meant by both “ machine” and “process” capability and...

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Mechanical Engineering

1.        

(a) Using a normal distribution,define what is meant by both “ machine” and “process” capabilityand explain the difference by providing three measures that areused in eachcase.                                                                   [8 marks]

(b) The following data was obtainedfrom subgroups of parts manufactured to 10.5 mm +/- 0.5 mm

Size Range(mm)                    Quantity

10.0-10.2                              1

10.2-10.4                              4

10.4-10.6                              9

10.6-10.8                               6

Determine :

The mean and standard deviation [use N = 20]                         [6 marks]

The values of the capability indices Cm and Cp                        [4 marks]

If the operation can be judged as “capable” if considered to bea machine or alternatively a process? [2 marks]

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