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Given the Following Process Control Data for a Normally Distributed

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Given the following process control data for a normally distributed quality variable (three samples of size four each):
Given the following process control data for a normally distributed quality variable (three samples of size four each): If the process is known to have a mean of 15 and a standard deviation of 3,using three sigma control limits,do any of the sample means indicate an out-of-control process mean? If the process is known to have a mean of 15 and a standard deviation of 3,using three sigma control limits,do any of the sample means indicate an out-of-control process mean?

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No,all are...

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