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What is the overall variance for the analysis

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A quantitative analysis for an analyte gives a mean concentration of 12.6 ppm. The standard deviation for the method is 1.1 ppm, and that due to sampling is 2.1 ppm.

(a) What is the overall variance for the analysis?

(b) By how much does the overall variance change if Sm is improved by 10% to 0.99 ppm?

(c) By how much does the overall variance change if Ss is improved by 10% to 1.9 ppm?

Reference no: EM131183541

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