Question: Suppose that the average number of defects in a unit is known to be 8. If the mean number of defects in a unit shifts

Suppose that the average number of defects in a unit is known to be 8. If the mean number of defects in a unit shifts to 16, what is the probability that it is detected by a U chart on the first sample following the shift

(a) if the sample size is n = 4?

(b) if the sample size is n = 10? Use a normal approximation for U.

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