Question: For a 3-sigma x-bar chart where the process standard deviation is known, the lower control limit: Group of answer choices is 3 below the mean

For a 3-sigma x-bar chart where the process standard deviation is known, the lower control limit:

Group of answer choices is

3 below the mean of sample means for a 3 control chart.

is 3 above the mean of sample means for a 3 control chart.

is 3/square root of (n) below the mean of sample means for a 3 control chart.

is 3/square root of (n) above the mean of sample means for a 3

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