Chapter 5, Problem 5.17P

a)

Interpretation Introduction

Interpretation:

The minimum expected coefficient of variation for interlaboratory results when the analyte concentration $\text{i) 1}\text{wt\% or ii)}\text{1 parts per trillion}$.

Concept Introduction:

Coefficient of variation:

The coefficient of variation is the standard deviation divided by mean, which usually stated as a percentage.

$\text{CV(\%)=100×}\frac{\text{s}}{\overline{\text{x}}}$

$\begin{array}{l}\text{Horwitz curve CV(\%)}\approx {\text{2}}^{\left(\text{1-0}\text{.5}\text{log}\text{C}\right)}\\ \text{where}\text{c}\text{=}\frac{\text{g}\text{analyte}}{\text{g}\text{sample}}\end{array}$

b)

Interpretation Introduction

Interpretation:

The minimum expected coefficient of variation for the class has to be calculated.

Concept Introduction:

Coefficient of variation:

The coefficient of variation is the standard deviation divided by mean, which usually stated as a percentage.

$\text{CV(\%)=100×}\frac{\text{s}}{\overline{\text{x}}}$

$\begin{array}{l}\text{Horwitz curve CV(\%)}\approx {\text{2}}^{\left(\text{1-0}\text{.5}\text{log}\text{C}\right)}\\ \text{where}\text{c}\text{=}\frac{\text{g}\text{analyte}}{\text{g}\text{sample}}\end{array}$