# CHIDIST

Returns the one-tailed probability of the chi-squared distribution. The c^{2} distribution is associated with a c^{2} test. Use the c^{2} test to compare observed and expected values. For example, a genetic experiment might hypothesize that the next generation of plants will exhibit a certain set of colors. By comparing the observed results with the expected ones, you can decide whether your original hypothesis is valid.

**Syntax**

**CHIDIST**(**x**,**degrees_freedom**)

**X** is the value at which you want to evaluate the distribution.

**Degrees_freedom** is the number of degrees of freedom.

**Remarks**

- If either argument is nonnumeric, CHIDIST returns the #VALUE! error value.
- If x is negative, CHIDIST returns the #NUM! error value.
- If degrees_freedom is not an integer, it is truncated.
- If degrees_freedom < 1 or degrees_freedom ³ 10^
^{10}, CHIDIST returns the #NUM! error value. - CHIDIST * mergeformat is calculated as cHIDIST = P(X>x), where X is a c
^{2}random variable.

**Example**

`CHIDIST(18.307,10)`

equals 0.050001