You are developing a procedure for determining traces of copper in biological ma

Question

You are developing a procedure for determining traces of copper in biological materials using a wet digestion followed by measurements by atomic absorption spectrophotometry. In order to test the validity of the method, you obtain a NIST orchard leaves standard reference material and analyze this material with your procedure five times and obtain a mean of 12.1_7 ppm with a standard deviation of o 08_5 ppm. The NIST sample is listed as 11.6 ppm. Does your method give a statistically valid value at the 95% confidence level?

Explanation / Answer

For the given data

analysis of copper

number of reading = 5

mean = 12.17 ppm

standard deviation = 0.085 ppm

at 95% confidence level the value range would be = 12.06446 and 12.27554

So, the NISTsample listed as 11.6 ppm does not fall in the given range and method does not give a valid statistical value.

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