(a) Determine the overall variance, the variance due to the method, and the variance due to sampling. (b) What percentage of the overall variance is due to sampling? (c)How might the variance due to...

(a) Determine the overall variance, the variance due to the method, and the variance due to sampling.

(b) What percentage of the overall variance is due to sampling?

(c)How might the variance due to sampling be decreased?

Extracted text: %w/w Pb %w/w Pb Replicate in Unknown in Standard 1 5.09 11.48 2 6.29 11.62 3 6.64 11.47 4 4.63 11.86