Chapter 4 Flashcards

1
Q

average

A

The sum of several values divided by the number of values. Also called mean.

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2
Q

blank solution

A

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.

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3
Q

calibration curve

A

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.

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4
Q

confidence interval

A

Range of values within which there is a specified probability that the true value lies.

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5
Q

degrees of freedom

A

In statistics, the number of observations minus the number of parameters estimated from the observations.

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6
Q

dynamic range

A

Range of analyte concentration over which a change in concentration gives a change in detector response.

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7
Q

Gaussian distribution

A

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.

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8
Q

Grubbs test

A

Statistical test used to decide whether to discard a datum that appears discrepant.

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9
Q

linear range

A

Concentration range over which the change in detector response is proportional to the change in analyte concentration.

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10
Q

linear response

A

The case in which the analytical signal is directly proportional to the concentration of analyte.

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11
Q

mean

A

The sum of several values divided by the number of values.

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12
Q

method of least squares

A

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.

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13
Q

outlier

A

A datum that lies far from the other data in a set of measurements.

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14
Q

standard deviation

A

A statistic measuring how closely data are clustered about the mean value.

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