Question: 17.3 Chemical analysis. To check a new analytical method, a chemist obtains a reference specimen of known concentration from the National Institute of Standards and

17.3 Chemical analysis. To check a new analytical method, a chemist obtains a reference specimen of known concentration from the National Institute of Standards and Tech nology. She makes 20 measurements of the concentration of this specimen with the new method and checks for bias by comparing the mean result with the known concentra tion.

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