Question: 1 (a) Process control charts may be classified under two broad headings, variables and attributes. Compare these two categories and indicate when each one is

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(a) Process control charts may be classified under two broad headings,

‘variables’ and ‘attributes’. Compare these two categories and indicate when each one is most appropriate.

(b) In the context of quality control explain what is meant by a number of defectives (np-) chart.

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