Objects of this class are returned by the functions: binom.test, chisq.test,
cor.test, fisher.test, friedman.test, kruskal.test, mantelhaen.test,
mcnemar.test, prop.test, t.test, var.test, and wilcox.test.
All of these functions, in the statistical inference module, create objects
of class "htest".
An object of class "htest" represents a test through
the estimation of a test statistic
given null and alternative hypotheses, and a confidence level.
The methods used in estimating these test statistics are varied ranging from
classical to robust and nonparametric approaches.