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Student's T Distribution Calculator - CDF 2 Tails

Calculates the Student's T distribution cumulative distribution function for 2 tails.

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See the Statistical Distributions Overview page for more statistical distribution calculators.

Example 1

What is the 2 tail probability associated with a Student’s T distribution with 10 degrees of freedom with a t-value of 1.812?

Value Keystrokes Display Description
10 df 10.00 Stores the df value.
1.812 x 1.812 Stores the x value.
  tdist 0.8999 Calculates the T distribution.

Example 2, Inverse

A hypothesis test requires a critical t-value from the Student's T-Distribution with 25 degrees of freedom. Find the t-value for a 2 tail probability of 0.95

Value Keystrokes Display Description
25 df 25.00 Stores the df value.
.95 tdist 0.95 Stores the tdist.
  x 2.060 Calculates the x value.

Reference:

Student's t-distribution - Wikipedia