TDIST

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.

Syntax

TDIST(x,degrees_freedom,tails)

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.

Remarks

• 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.

Example

TDIST(1.96,60,2) equals 0.054645