Z-Score: 4.5

p value: 0.0000

This result is statistically significant

p value: 0.0000

This result is statistically significant

This p value calculator allows you to convert your Z-statistic into a p value and evaluate it for a given significance level. Simply enter your Z score (we have a Z score calculator if you need to solve for the Z-statistic) and hit calculate. It will generate the p-value for that Z-statistic. This standard score indicates the probability of that value occuring within a variable that follows the standard normal distribution.

If you're just using this as a tool to check your homework, that should be sufficient. However, if you enter a given significance level and specify if you want to look at this as a one-tailed or two-tailed probability, the p value calculator will also render an opinion on the statistical significance of that result.

This tool effectively replaces the use of a Z-score table. We have another version that works for calculating the p value from a t statistic if you are working with small sample sizes and need to use Student's t-distribution.

For other resources, check out this overview or this tutorial video.