solvedwithstats
An interactive statistical toolbox. SWS does; SBS explains.
Type in your numbers and get a correct, transparent answer — computed entirely in your browser, no account, no tracking, no server round-trip. Every tool links to a companion explainer on Solved By Stats.
Tools
- Estimation
Confidence Interval Calculator
t-interval for a mean (from raw data or a summary) and Wilson / normal intervals for a proportion. Shows its work.
- Hypothesis testing
Welch's Two-Sample t-test
Compare two independent groups with unequal variances — t, Welch–Satterthwaite df, p-value, CI, and Cohen's d. Raw data or summary stats.
More tools are on the way — statistics, probability, graph theory, and geometry. Each ships alongside a plain-language explainer on Solved By Stats.