10. You are developing a procedure for determining traces of copper materials us

Question

10. You are developing a procedure for determining traces of copper materials using a wet digestion followed by measurement by atomic absorption spectrophotometry. In order to test the validity of the method, you obtain an NIST orchard leaves standard reference material and analyze this material. Five replicas are sampled and analyzed, and the mean results are found to be 10.8 ppm with a standard deviation of plus or minus 0.7. ppm. The listed value for the standard reference is 11.7 ppm. Does your method give a statistically correct value at the 95% confidence level?

Explanation / Answer

Let us applying the standard deviation formula

    If you add up the mean and standard deviation

        10.8+0.7=11.5

SO , it is close to the 11.7ppm . Yes , it is correct upto 95%level but not 100%.

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