Ugh, I knew I should have spent more time studying control charts. Well, I'm going with C and hoping for the best. Maybe I'll get lucky and the 'Xbar-R' part will jog my memory.
Ha! I bet the test writers were trying to trick us with those other chart types. Xbar-R charts are the only ones where the control limits change with sample size. Easy peasy!
Pearly
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