Online Critical z-score Calculator

An implementation of the Critical z-score Calculator occurs below.

The significance level (which is the area under either the tail (for the one-tailed test) or the tails (for the two-tailed test) of the distribution) needs to be a positive number between 0 and 1 - a commonly used value is 0.05, for the 5% significance level.

Check for one tailed test - uncheck for two tailed test.

Significance level:

Results pending...

	Plot of distribution ($f(x)$) values against $x$ values
$f(x)$	0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -1.0 -0.5 0.0 0.5 1.0
	$x$