Question: Reconsider Exercise 15-4(a). Assuming that both charts exhibit statistical control and that the process specifications are at 20 5, estimate PCR and PCR k

Reconsider Exercise 15-4(a). Assuming that both charts exhibit statistical control and that the process specifications are at 20 ± 5, estimate PCR and PCR_k and interpret these ratios.

Data from 15-4

Samples of size n = 6 are collected from a process every hour. After 20 samples have been collected, we calculate x̅ = 20.0 and r̅ / d₂ = 1.4.

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