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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.

ステップバイステップガイド

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

解いた例

入力

z-score of 1.96

結果

p = 0.05 (two-tailed)

Boundary of the 95% confidence interval

入力

z-score of 2.576

結果

p = 0.01

99% confidence level boundary

入力

t-statistic 2.5, df=20

結果

p ≈ 0.021

Significant at α=0.05 but not α=0.01

よくある質問

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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