An Analyst Is Assigned a Blind Quality Control Sample of Blood

question 28

Multiple Choice

An analyst is assigned a blind quality control sample of blood containing a drug metabolite. He tests ten separate portions and obtains the following data for the concentration in ug/mL:
25.2
24.8
26.6
27.0
24.0
26.0
25.5
26.3
24.9
23.9
The accepted true value of this sample is 24.7 ug/mL. What is the absolute error between the mean obtained by the analyst and the accepted true value? Report to two significant figures

• A) -1.30
• B) 0.72
• C) 0.93
• D) -0.99
• E) 1.01
• F) -0.77

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Definitions:

Reaction

A process in which chemical substances interact to form new substances with different chemical compositions and properties.

4-bromobenzonitrile

An organic compound consisting of a benzene ring substituted with a bromine atom and a nitrile group at different positions.

Benzene

A cyclic hydrocarbon with the formula C6H6, notable for its highly symmetrical ring structure and resonance stability.

Major Organic Product

The primary substance formed in the largest quantity during a chemical reaction involving organic compounds.