Flashcards in Chapter 4 Deck (14)
The sum of several values divided by the number of values. Also called mean.
A solution not intended to contain analyte. It could be made from all reagents - except unknown- that would be used in an analytical procedure. Analyte signal measured with a blank solution could be due to impurities in the reagents or, possibly, interference.
A graph showing the value of some property versus concentration of analyte. When the corresponding property of an unknown is measured, its concentration can be determined from the graph.
Range of values within which there is a specified probability that the true value lies.
degrees of freedom
In statistics, the number of observations minus the number of parameters estimated from the observations.
Range of analyte concentration over which a change in concentration gives a change in detector response.
Theoretical bell-shaped distribution of measurements when all error is random. The center of the curve is the mean and the width is characterized by the standard deviation.
Statistical test used to decide whether to discard a datum that appears discrepant.
Concentration range over which the change in detector response is proportional to the change in analyte concentration.
The case in which the analytical signal is directly proportional to the concentration of analyte.
The sum of several values divided by the number of values.
method of least squares
Process of fitting a mathematical function to a set of measured points by minimizing the sum of the squares of the distances from the points to the curve.
A datum that lies far from the other data in a set of measurements.