Matematika

Kalkulačka p-hodnoty

P-Value Calculator

Z-score (test statistic)

What is P-Value Calculator?

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The p-value is the probability of observing results as extreme as your data, assuming the null hypothesis is true. A small p-value (typically < 0.05) suggests the results are unlikely to be due to chance, providing evidence against the null hypothesis.

DigiCalcs delivers precision-engineered tools for engineers and STEM professionals.

How to P-Value Calculator

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1Define null hypothesis H₀ and alternative hypothesis H₁
2Calculate the test statistic (z, t, F, or χ²) from your sample data
3Find the probability of getting a test statistic this extreme under H₀
4This probability is the p-value

Worked Examples

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Example 1

Given:z-score of 1.96

Výsledok:p = 0.05 (two-tailed)

Boundary of the 95% confidence interval

Example 2

Given:z-score of 2.576

Výsledok:p = 0.01

99% confidence level boundary

Example 3

Given:t-statistic 2.5, df=20

Výsledok:p ≈ 0.021

Significant at α=0.05 but not α=0.01

Frequently Asked Questions

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What is P Value Calc?

The p-value is the probability of observing results as extreme as your data, assuming the null hypothesis is true. A small p-value (typically < 0

How accurate is the P Value Calc calculator?

The calculator uses the standard published formula for p value calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the P Value Calc calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the P Value Calc calculator use?

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.

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Pro Tip

A p-value < 0.05 does not mean the effect is large or practically important. A study with 10,000 participants can find statistically significant but trivially small effects. Always report effect sizes alongside p-values.

References

Deep Dive

Read the full guide on how to use this calculator effectively

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P-Value vs Confidence Interval

Accuracy-checked

Reviewed October 2026

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