P-Value Calculator
Compute p-values using the standard normal (z) distribution.
Uses z statistic (normal distribution). For t-tests, a t-distribution is needed.
About This Calculator
The P-Value Calculator computes the probability of observing results at least as extreme as your data, assuming the null hypothesis is true. Essential for hypothesis testing.
How to Use
- Enter your test statistic (z-score or t-value)
- Select the test type (one-tailed or two-tailed)
- Click Calculate to see the p-value
- Compare to your significance level (α)
Practical Use Cases
- Research: Test statistical hypotheses
- Science: Evaluate experimental results
- Medicine: Assess treatment effectiveness
- Quality Control: Test process changes
- Social Science: Analyze survey results
? Frequently Asked Questions
How accurate is this
This calculator uses standard formulas and provides accurate results for typical use cases. For professional or critical applications, always verify results with certified professionals or official sources.
Is this calculator free to use?
Yes, this Statistics is completely free to use with no registration required. You can use it as many times as needed without any limitations.
Can I use this on mobile devices?
Absolutely! This calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers.
How do I interpret the results?
The results are displayed clearly with appropriate units. Refer to the "About This Calculator" section for detailed information.