Question: It is known from past experience that the standard deviation for a spectrophotometric method used to determine manganese in ore is = 0.12% Mn (absolute).

It is known from past experience that the standard deviation for a spectrophotometric method used to determine manganese in ore is = 0.12% Mn (absolute). A sample is analyzed by this method giving a result of 9.56% manganese. At 95% confidence, calculate the interval within which you would expect to find the true value if the analysis is based on: a) a single determination, b) the average of four determinations, and c) the average of nine determinations.

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