A laboratory technician is given a blood sample and asked to calculate the concentration of dopamine. The first test reveals that the concentration of dopamine falls outside the reliable range for the testing method.
He adds 100 L saline solution to 100 L of the sample and retests the sample. How does the concentration of dopamine in the diluted sample compare to the concentration of dopamine in the original sample?
A) The concentration in the diluted sample is one-half that of the original sample.
B) The concentration in the diluted sample is one hundred times that of the original sample.
C) The concentration in the diluted sample is one-tenth that of the original sample.
D) The concentration in the diluted sample is twice that of the original sample.
Question 2
How can the effects of random error be minimized?
A) By averaging a large number of results
B) By having all tests performed by the same technician
C) By multiplying the results by a constant standard
D) By performing control tests in a fixed environment
An example of a homeostatically controlled variable: blood levels of glucose in a human.
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