P-Value Calculator
Calculate p-values from z-scores to assess statistical significance.
Test Parameters
The z-score from your hypothesis test
Understanding P-Values
The p-value is the probability of obtaining results at least as extreme as the observed results, assuming the null hypothesis is true.
Interpretation:
- p < 0.01: Highly significant
- p < 0.05: Significant
- p < 0.10: Marginally significant
- p ≥ 0.10: Not significant
Common Z-Scores:
- z = ±1.645 → p ≈ 0.10 (two-tailed)
- z = ±1.96 → p ≈ 0.05 (two-tailed)
- z = ±2.576 → p ≈ 0.01 (two-tailed)
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P-Value Result
Two-tailed test
P-Value0.05
Statistically Significant?Yes (p < 0.05)
InterpretationSignificant - moderate evidence against null hypothesis
✓ Result is statistically significant at α = 0.05
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