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The z-score is the number of standard deviations a control result is from the expected mean. Use the following formula to calculate the z-score:
A z-score of 2.3 indicates the observed value is 2.3SD away from the expected mean. A data point with this z-score would violate the 1-2s rule, but not the 1-3s rule. The z-score appears on the Single Test Point Data Entry dialog box.
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