An Analyst Is Assigned a Blind Quality Control Sample of Blood

question 30

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 % error between the mean obtained by the analyst and the accepted true value? Report to two significant figures

• A) 2.9
• B) -2.9
• C) 4.2
• D) -4.2
• E) None of the above

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