D) Plus or minus four standard deviations? Sounds like the acceptable range for my sleep schedule during exam week. I'm going with C, but I might need those extra deviations later.
E) Plus or minus five standard deviations? Wow, might as well just ditch the control chart and let the process run wild! What, are we trying to catch Godzilla here?
Aha! C) Plus or minus three standard deviations, of course. Anything less and it would be too narrow, anything more and it would be overkill. Nailed it!
Darrin
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