Question

5. Mr. Shumba and co-workers developed a new analytical method for measuring trace levels of atmospheric gases. The analysis of a sample containing 40.0 ppm 2-chloroethylsulfate yielded the following results: 43.3 34.8 31.9 37.8 34.8 31.9 42.1 33.6 35.3 a) Determine whether there is a significant difference between the experimental mean and the expected value at ? = 0.05 b) As part of this study a reagent black was analysed 12 times, giving a mean of 0.16 ppm and a standard deviation of 1.20 ppm. What is the IUPAC detection limit, the limit of identification from this method assuming ? = 0.05?

          5. Mr. Shumba and co-workers developed a new analytical method for measuring trace levels of atmospheric gases. The analysis of a sample containing 40.0 ppm 2-chloroethylsulfate yielded the following results:
43.3  34.8  31.9  37.8  34.8  31.9  42.1  33.6  35.3
a) Determine whether there is a significant difference between the experimental mean and the expected value at ? = 0.05
b) As part of this study a reagent black was analysed 12 times, giving a mean of 0.16 ppm and a standard deviation of 1.20 ppm. What is the IUPAC detection limit, the limit of identification from this method assuming ? = 0.05?

5. Mr. Shumba and co-workers developed a new analytical method for measuring trace levels of atmospheric gases. The analysis of a sample containing 40.0 ppm 2-chloroethylsulfate yielded the following results:
43.3 34.8 31.9 37.8 34.8 31.9 42.1 33.6 35.3
a) Determine whether there is a significant difference between the experimental mean and the expected value at ? = 0.05
b) As part of this study a reagent black was analysed 12 times, giving a mean of 0.16 ppm and a standard deviation of 1.20 ppm. What is the IUPAC detection limit, the limit of identification from this method assuming ? = 0.05?

Added by Margaret P.

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