Tdistribution
Calculator  Online
Below you can
find a Tdistribution Calculator. The shape of the
Student's tdistribution is determined by the degrees of freedom. Its
shape changes as the degrees of freedom increases.

Student's
tdistribution curve 
The
shaded area represents the righttail value for t.
The
righttail value is approximated by using the following formula:
where
a_{1}
= 0.196854
a_{2}
= 0.115194
a_{3}
= 0.000344
a_{4}
= 0.019527
d =
degrees of freedom
Example:
Determine the righttail value when t = 2.9 and degrees of
freedom dof = 16.
Enter Tvalue
= 2.9
Enter Degrees
of freedom = 16
and you get from the calculator
Righttail
value = 0.0051
Lefttail
value = 0.9949
This is an image showing another example of how you can use the calculator:
Please,
enable JavaScript codes on this page, otherwise the calculator will not
work.


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