For a 3-sigma x-bar chart where the process standard deviation is known, the upper control limit:
A) is 3? below the mean of sample means for a 3? control chart.
B) is 3? above the mean of sample means for a 3? control chart.
C) is 3?/ below the mean of sample means for a 3? control chart.
D) is 3?/ above the mean of sample means for a 3? control chart.
E) cannot be calculated unless the average range is known.
D
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Mediamark has developed a service to measure video game audiences
a. True b. False Indicate whether the statement is true or false