Question: In a computer control system, the high and low warning limits for a critical temperature measurement are set at the 2-sigma limits, T 2T.

In a computer control system, the high and low warning limits for a critical temperature measurement are set at the “2-sigma limits,” T’ ± 2σT. Where T is the nominal temperature and σT is the estimated standard deviation, if the process operation is not-mal and the temperature is measured every minute, how many “false alarms’ (that is, measurements that exceed the warning Limits) would you expect to occur during an eight-hour period?

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