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Given this Xbar and S data. What is the value for Sbar? Subgroup Xbar 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 SUM O 0.019 O 0.020 O 0.021 O 0.022 12.71 12.72 12.71 12.71 12.74 12.71 12.72 12.73 12.71 12.73 12.69 12.66 12.67 12.67 12.69 12.70 12.72 12.73 12.72 12.73 12.72 266.88 S 0.033 0.031 0.017 0.024 0.012 0.014 0.019 0.018 0.024 0.032 0.020 0.019 0.020 0.024 0.031 0.017 0.020 0.012 0.023 0.012 0.016 0.438