Question: Control limits are constructed for the average temperature in a furnace. Twenty five samples of size 4 are selected. The data yielded an average temperature

Control limits are constructed for the average temperature in a furnace. Twenty five samples of size 4 are selected. The data yielded an average temperature of 5000C and an estimate of the standard deviation of the temperature as 50C. The specification on temperature are 4950 + 120C.

a. find the natural tolerance limits

b. find the capability index cpk and comment on its value

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