Question: For an X-bar chart, the upper and lower controls limits are usually set ___. at +/- three standard deviations of the process average at +/-

  1. For an X-bar chart, the upper and lower controls limits are usually set ___.
  1. at +/- three standard deviations of the process average
  2. at +/- two standard deviations of the process average
  3. the discretion of process experts without regard to past history
  4. at +/- 1.5 standard deviations of the process average.

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