A company produces small roller bearings whose internal diameter is a critical feature. They are required to have an average diameter of 3mm with a standard deviation of 0.2mm. The rectifying machine works on two shifts. Cycle time is 2 minutes.

SO

✓

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In order to verify this diameter a Control Chart system must be established that:

ARL = 200 observations The probability of identifying a shift of 0.06mm within 2 hours is at least 95%.

You can integrate the missing data by proposing additional hypothesis.