Question: Reconsider Exercise 15-3. Suppose that the variable is normally distributed with specifications at 220 ± 50. What is the proportion out of specifications? Estimate and

Reconsider Exercise 15-3. Suppose that the variable is normally distributed with specifications at 220 ± 50. What is the proportion out of specifications? Estimate and interpret PCR and PCR_k.

Exercise 15-3

Control charts are to be constructed for samples of size n = 4, and xÌ… and s are computed for each of 20 preliminary samples as follows:

20 20 s-271.6 -4460 i=1 i=1

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