## Z-test p Value Calculator

Use this calculator to compute the p-value of test based on normal distribution.

## $p$-Value of Z-test

If the test statistic $Z$ has standard normal distribution, then the $p$-value of the test

a. left-tailed hypothesis is $p$-value = $P(Z\leq z_{obs})$.

b. right-tailed hypothesis is $p$-value = $P(Z\geq z_{obs})$.

c. two-tailed hypothesis is $p$-value = $2P(Z\geq |Z_{obs}|)$.