What it does
Statistics Kingdom provides descriptive statistics, distributions, hypothesis tests, confidence intervals, regression and study-design tools.
Statistics Kingdom separates paired, independent, pooled and Welch methods with a decision tree. Its Welch page accepts raw observations, a pasted two-column block with headers, or each group's mean, size and sample SD. Empty and non-numeric cells are not counted. Controls include tails, significance and a hypothesized mean difference. For raw data, the page documents Shapiro–Wilk testing, outlier calculations and generated R code. The model does not require equal population variances, but it retains a normal-distribution assumption. A Load last run control is visible; its storage and retention are unspecified.
Strengths
- Detailed separation of statistical test types
- Study-design and distribution tools
Best for
- Selecting and calculating a statistical method
Sources
- Statistics online - checks assumptions, interprets results (Oct 26, 2026)
- Two Sample Welch t-Test Calculator - Statistics Kingdom (Oct 26, 2026)