Critical Value Calculator

Find critical values and rejection regions for one-tailed or two-tailed tests under Z, t, chi-square, and F distributions.

Choose the test statistic distribution (standard normal, t-Student, chi-square, or Fisher-Snedecor F).

Select left-tailed, right-tailed, or two-tailed test type and set the significance level α.

Compute critical value cutoffs and rejection regions, including degree-of-freedom support for t, χ², and F distributions.

What distribution?

What type of test?

Degrees of freedom (d)

Significance level

Critical value output

The test statistic follows t distribution with 15.000000 degrees of freedom.

Critical value(s)

-2.131450, 2.131450

Rejection region(s)

(-∞, -2.131450] ∪ [2.131450, ∞)