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 = $2P(Z\geq |Z_{obs}|)$.
