Question: X and R charts should be used when subgroup size n is and X and s charts should be used when subgroup size n is

X and R charts should be used when subgroup size n is and X and s charts should be used when subgroup size n is (a) smaller than 4: larger than 4 (b) smalier than 10: larger than 10 (c) larger than 4 ; smaller than 4 (d) larger than 10: smaller than 10

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