# Studentized Range Distribution (3 of 3)

Since the computed value of t

_{s} is always 1.414 times the value
of t, the tests using t

_{s} and t are identical whenever there
are only two means in an experiment. The difference between the t and
the studentized t distributions occurs when there are more than two
means. The figure below shows the critical value of t for the
0.05 level as a function of the number of means. This figure is based
on an experiment with 24

degrees of freedom.
Naturally, the more means, the higher the critical value of t

_{s}.

See also:

Duncan, Newman
Keuls, and

Tukey HSD