An analyst obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points. A 7.24 + 0.74% 7.24 + 0.13% 7.24 ± 0.27% 7.24 + 0.42%

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