Question: Suppose that a quality characteristic is normally distributed with specifications from 20 to 32 units. (a) What value is needed for to achieve a

Suppose that a quality characteristic is normally distributed with specifications from 20 to 32 units.

(a) What value is needed for σ to achieve a PCR of 1.5?

(b) What value for the process mean minimizes the fraction defective? Does this choice for the mean depend on the value of σ?

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