Returns the Student's t-distribution. The t-distribution is used in the hypothesis testing of small sample data sets. Use this function in place of a table of critical values for the t-distribution.
X is the numeric value at which to evaluate the distribution.
Degrees_freedom is an integer indicating the number of degrees of freedom.
Tails specifies the number of distribution tails to return. If tails = 1, TDIST returns the one-tailed distribution. If tails = 2, TDIST returns the two-tailed distribution.
- If any argument is nonnumeric, TDIST returns the #VALUE! error value.
- If degrees_freedom < 1, TDIST returns the #NUM! error value.
- The degrees_freedom and tails arguments are truncated to integers.
- If tails is any value other than 1 or 2, TDIST returns the #NUM! error value.
- TDIST is calculated as TDIST = p( x<X ), where X is a random variable that follows the t-distribution.
TDIST(1.96,60,2) equals 0.054645