UPDATED QUESTIONS AND CORRECT
ANSWERS
Accuracy - CORRECT ANSWERS✅✅The closeness with which a measurement comes to
the true value
Precision - CORRECT ANSWERS✅✅The degree of reproducibility in the measurement of
a substance
Mean - CORRECT ANSWERS✅✅Sum of all of a set divided by the number in the set
(average)
Median - CORRECT ANSWERS✅✅The point on the scale that has equal number of
observations above and below (even number, take the two-center numbers add and divide by
2)
Mode - CORRECT ANSWERS✅✅The value in a set that occurs most frequently
Norm. Distribution - CORRECT ANSWERS✅✅The theoretical bell-shaped curve based in
the Gaussian Law of Errors.
Normal Frequency Curve
Standard Deviation - CORRECT ANSWERS✅✅A statistical calculation that measures the
scatter of sample values around the mean. (The acceptable variation from the mean) The
clinical lab uses 2 SD as an acceptable variation in a method of analysis.
Confidence Limits - CORRECT ANSWERS✅✅An expression of the amount of error that
can be allowed in the recovery of a value without affecting the validity
Coefficient of Variation - CORRECT ANSWERS✅✅An expression of standard deviation as
a percentage of the mean
A way of comparing the precision of different methods of assay
, Also a better way to check the precision at various levels of concentration
Bias - CORRECT ANSWERS✅✅A constant departure of quantity from the true value due
to outside influence
Random Error - CORRECT ANSWERS✅✅An error that does not occur in any regular
predictable pattern
Systematic Error - CORRECT ANSWERS✅✅A regularly occurring error that is constant,
predictable, and traceable
Shift - CORRECT ANSWERS✅✅Six to ten control values fall consecutively above or
below the mean
Trend - CORRECT ANSWERS✅✅An uninterrupted rise or decline away from the mean
Primary Standard - CORRECT ANSWERS✅✅A solution generally containing a single
purified solute in a pure solvent
The true value of the solvent is known by exact measurement (Analytical Balance) Used to
"set" or calibrate an instrument
Secondary Standard - CORRECT ANSWERS✅✅A material with an established value(s)
determined by assay against a primary standard
It may contain one or more constituents
Control - CORRECT ANSWERS✅✅Usually pooled human sera containing a number of
substances used to verify the precision of a method
Mole - CORRECT ANSWERS✅✅Atomic Weight
Molarity - CORRECT ANSWERS✅✅Atomic Weight/1 Liter (1000 mL)