One sample z-test
Hypothesis tests · Method and input reference
Tests are two-sided. Normality reports Shapiro–Wilk and D’Agostino–Pearson where sample size permits. Outliers use Tukey 1.5×IQR fences; observations are not removed. Synthetic example: 120 baseline systolic blood pressures (mmHg), with between-person variation. Illustrative data, not clinical evidence.
Open calculator · Compare methods in the decision matrix
Required inputs
- Observations — Numeric observations; preserve the row and column structure described above.
- Null mean — Enter the method parameter described above.
- Known population SD — Enter the method parameter described above.
Review missing values and data coding before running. Sample inputs are synthetic teaching examples.
Implementation
Lifescio implements the method-specific formula using the listed SciPy distribution functions and NumPy array arithmetic. See method help for assumptions.
- scipy 1.15.3: scipy.stats.norm.sf
These are pinned library versions; saved results record the versions actually used at runtime.