Following a Precision Study in Which Repeatability and Reproducibility of 20

question 5

Multiple Choice

Following a precision study in which repeatability and reproducibility of 20 samples are assessed,which one of the following formulae would be used to determine the total standard deviation ( $\sigma$ ²_T) ?

• A) .\(\sigma\)²_within-run/2 + \(\sigma\)²_between-run
• B) (x2_i - x1_i)
• C) .\(\Sigma\)(x₁ -\(\mu\))²/N
• D) .\(\Sigma\)²_within-run + \(\Sigma\)²_between-run

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