In a murder trial in the 1990s, the defendant's blood was found at the crime scene. The prosecutor argued that
(a) Precision and accuracy. To measure accuracy and precision of the method, blood was fortified with EDTA to known levels.
For each of the three spike levels in the table, find the precision and accuracy of the quality control samples.
EDTA measurements (ng/mL) at three fortification levels
(b) Detection and quantitation limits. Low concentrations of EDTA near the detection limit gave the following dimensionless instrument readings: 175, 104, 164, 193, 131, 189, 155, 133, 151, and 176. Ten blanks had a mean reading of 45.0. The slope of the calibration curve is 1.75 Ã 109 M-1. Estimate the signal and concentration detection limits and the lower limit of quantitation for EDTA.
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