as a group. The null hypothesis is that two variances are the same – so the proposed grouping is not meaningful. In the table below, the symbols used are defined at the bottom of the table. Many other tests can be found in other articles. Proofs exist that the test statistics are appropriate. See also Null distribution Likelihood-ratio test Neyman–Pearson lemma = coefficient of determination Sufficiency (statistics) References Statistical hypothesis testing Statistical tests Sample statistics