How to Calculate P-Value
What is P-Value?
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.
Step-by-Step Guide
- 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
Frequently Asked Questions
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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