Question: A process is being monitored using control limits (LCL, UCL), based on the average of samples of size 8 and a three standard deviation rule

A process is being monitored using control limits (LCL, UCL), based on the average of samples of size 8 and a three standard deviation rule (i.e. UCL = process mean + 3 * std. dev. of sample average). If they decide to change the sample size to 12, how would the control limits change (following the same three standard deviation rule)?

They won't change - they are based on the product specifications

The new limits will be wider than the old

The new limits would be narrower than the old

Cannot be determined from the given data

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