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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Definitions:

Deductive Reasoning

An approach to reasoning where the outcome is derived by the alignment of various premises assumed to be accurate.

Sex Hormones

Chemical substances produced by the endocrine system that regulate sexual development, reproductive functions, and secondary sexual characteristics.

Estrogen

A group of steroid hormones that play a key role in the development and regulation of female reproductive and secondary sexual characteristics.

Inverse Relationship

A correlation where an increase in one variable leads to a decrease in another variable, or vice versa.