Page 26 - Quality control of pharmaceuticals (07-PA 704)

Standard Deviation

Variance
The mean of the squares of the deviations of the individual values from
the population mean.

Skewness
Kurtosis
The peakedness of a distribution.

Flat platykurtic
Very peaked leptokurtic
In between mesokurtic

Areas (Probabilities) associated with the Normal Curve

Statistical Treatment of Random Errors
We can use statistical methods to evaluate the random errors.
Generally, we base statistical analyses on the assumption that random

errors in analytical results follow a Gaussian, or normal,
distribution.