An Analyst Decides to Calculate the %Error as a Measure

Multiple Choice

An analyst decides to calculate the %error as a measure of bias. A certified reference material (CRM) contains a drug metabolite at a concentration of 12.8 micromolar 0.03 micromolar. The analyst tests this sample and obtains a result of 12.1 micromolar 0.1 micromolar. What is the %error (to one decimal place) ?

A) 5.5
B) -5.5
C) -5.8
D) 5.8
E) none of the above