Critical value
Hypothesis tests · Method and input reference
Two-sided probability is twice the smaller tail; critical values are equal-tail cutoffs. Use the tail appropriate to the test.
Open calculator · Compare methods in the decision matrix
Required inputs
- Reference distribution — Choose normal, t, chi2, f.
- Test statistic — Enter the method parameter described above.
- Degrees of freedom — Enter the method parameter described above.
- Denominator degrees of freedom — Enter the method parameter described above.
- Significance level — Enter the method parameter described above.
- Tail — Choose two-sided, upper, lower.
Review missing values and data coding before running. Sample inputs are synthetic teaching examples.
Implementation
Lifescio validates inputs and formats results; listed functions are the principal calculation routines, not an exhaustive transitive dependency list.
- scipy 1.15.3: scipy.stats.norm, scipy.stats.t, scipy.stats.chi2, scipy.stats.f
These are pinned library versions; saved results record the versions actually used at runtime.