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(a). There is a claim that the average diameter of bolt supplied to a company is 12mm. If the mean and standard deviation of a

(a). There is a claim that the average diameter of bolt supplied to a company is 12mm. If the mean and standard deviation of a sample of 100 bolts is 12.068 and 0.4 respectively, is the claim correct at =0.05? What will be the conclusion if N=10?

(b). Wha do you understand by statistical Quality control and why is it necessary?

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