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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,what is the mean of the sampling distribution of sample means for whenever this process is under control? The standard deviation? If the process is known to have a mean of 15 and a standard deviation of 3,what is the mean of the sampling distribution of sample means for whenever this process is under control? The standard deviation?

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