Editing Student's t-distribution (section)

====Hypothesis testing====
A number of statistics can be shown to have {{mvar|t}}&nbsp;distributions for samples of moderate size under [[null hypothesis|null hypotheses]] that are of interest, so that the {{mvar|t}}&nbsp;distribution forms the basis for significance tests. For example, the distribution of [[Spearman's rank correlation coefficient]] {{mvar|ρ}}, in the null case (zero correlation) is well approximated by the {{mvar|t}} distribution for sample sizes above about 20.{{citation needed|date=November 2010}}