UnitCompiler
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p-value Calculator

Hypothesis testing significance calculator for Z, t, and Chi-Square distributions.

p-value Calculator (Hypothesis Testing)

Determine exact p-values for Z-scores, Student's t-tests, and Chi-Square with significance verdict.

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Statistical Test:
Alternative Hypothesis Tail:
Calculated p-value (Probability)
0.05000
✓ Statistically Significant at α = 0.05 (Reject H₀)
α = 0.05 (95% Conf)
Reject Null (p ≤ 0.05)
α = 0.01 (99% Conf)
Fail to Reject (p > 0.01)
α = 0.001 (99.9% Conf)
Fail to Reject

Understanding p-values & Alpha (α)

The p-value measures the probability of obtaining test results at least as extreme as the observed data, assuming the null hypothesis (H₀) is true.

p ≤ 0.05
Standard threshold: Statistically significant (Reject H₀).
p ≤ 0.01
High significance: Very strong evidence against H₀.
p > 0.05
Insufficient evidence to reject null hypothesis.