The F test tells us whether two standard deviations are "significantly different from each other. F is the quotient of the squares of the standard deviations [Pg.63]

The fraction of the analyte in the test sample. The mass fraction is a dimensionless number. However, the mass fraction is usually reported as a quotient of two mass-units or mass-volume. [Pg.9]

In Case a, only the standard deviation estimated from the experimental data for the test sample is needed, which is then used to normalize the difference Xmean f - The quotient difference/.5 c, the so-called Student s f, is compared with the critical tc for a chosen confidence level and f n - 1. (Use Eq. 1.13.) [Pg.48]

© 2019 chempedia.info