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Calibration and Measurement Uncertainty
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ACT Prep
AS.059 Calibration and Measurement Uncertainty
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Research Summary: In a long sample run, a quality-control standard reads 50.0 mg/L at the beginning, 52.4 mg/L after 10 samples, and 55.8 mg/L after 20 samples. Which revision best improves the run?
A
Place all unknown samples before any standards so drift is hidden, when the stated controls and comparison conditions are applied.
B
Use only the first standard reading because it was correct, based on the information available in the passage and display.
C
Average the standards and assign that average to every unknown sample, under the conditions and evidence described in the passage.
D
Insert quality-control standards at regular intervals and recalibrate or correct when drift exceeds limits.
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