A quality-control apprentice is preparing a CUSUM chart. The values calculated for SL and SH are presented in the following table. Three of the values have been calculated incorrectly. Which are they? Sample SL SH 2 3 -1.3280 -1.4364 -2.0464 -1.6370 -0.8234 0.2767 -0.4528 0.1106 10 0.7836 11 0.2371 0.0097 12 0.7104 13 0.2775 14 0.5842 15 0.3750 16 0.4658 17 0.1866 18 0.3277 19 -0.2036 20 -0.7345

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