CHISQ.INV.RT function

The CHISQ.INV.RT function in Excel returns the inverse of the right-tailed probability of the chi-squared distribution. This is used to find the chi-squared value for a given right-tailed probability and degrees of freedom. It is often used in hypothesis testing when you want to determine the critical value of a chi-squared distribution for a specific significance level.

Syntax:

CHISQ.INV.RT(probability, deg_freedom)

Arguments:

• probability: The right-tailed probability for which you want to find the chi-squared value (a value between 0 and 1). This represents the probability of observing a value greater than the chi-squared statistic.
• deg_freedom: The number of degrees of freedom for the chi-squared distribution (positive integer).

Example:

If you want to find the chi-squared value such that the right-tailed probability is 0.05 with 10 degrees of freedom (commonly used for a 95% confidence level), you would use:

=CHISQ.INV.RT(0.05, 10)

This will return the chi-squared value for which the area to the right of it under the chi-squared distribution curve is 0.05. This value can be compared with the chi-squared test statistic in hypothesis testing to assess the significance of a result.