CHIDIST

Returns the one-tailed probability of the chi-squared distribution. The c² distribution is associated with a c² test. Use the c² 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 c² random variable.

Example

CHIDIST(18.307,10) equals 0.050001