Conquer Statistics

Turn statistics from formulas you memorize into ideas you can see, explain, and use. Conquer Statistics builds statistical intuition across five parts: Part 1: Exploring one-variable data and collecting data • Investigative questions, populations and samples, parameters and statistics • Categorical data, bar charts, pie charts • Dotplots, stemplots, histograms, cumulative frequency plots • Describing distributions, center and spread, z-scores, boxplots • Sampling methods, bias, observational studies, and experiments Part 2: Probability, random variables, and sampling distributions • Two-way tables, probability rules, conditional probability, independence • Random variables, expected value, variance • Binomial and normal distributions, normal calculations • Sampling distributions and the central limit theorem Part 3: Inference for proportions and categorical data • Estimators and sampling distributions • Confidence intervals and tests for one proportion • Confidence intervals and tests for two proportions • Chi-square tests of independence and homogeneity Part 4: Inference for means and quantitative data • Sampling distribution of means and the t-distribution • Confidence intervals and tests for one mean • Paired data and two independent samples • Simulation p-values, power, and errors Part 5: Regression analysis • Scatterplots, correlation, coefficient of determination • Least-squares regression line, slope and intercept • Residuals, residual plots, and influence Every part includes • Knowledge cards with definitions, key points, worked examples, pitfalls, and tips • Practice sets with multiple-choice and free-response questions, full explanations, and rubrics • A reference sheet of formulas, terms, and statistical-thinking tips Why it works • Charts are drawn inside the app: histograms, boxplots, normal curves, scatterplots, and regression lines — crisp and easy to read in dark mode • Three interface languages: Traditional Chinese, Simplified Chinese, English • Progress, answer history, and mistakes stay on your device; no account needed • Works offline after the first download • No ads, no in-app purchases, no third-party tracking Who it's for • High-school and university students learning statistics • Learners reviewing statistical concepts and problem-solving methods • Self-learners who want to read and reason with data Privacy No account is required. To download lessons and understand app usage, the app contacts our content server with a randomly generated installation identifier. The server records the installation identifier, IP address, IP-derived country, platform, operating system version, app version, last-used time, and request count for content delivery, access recognition, and usage statistics; it is not used for tracking and is never sold. Learning progress stays on your device. Usage data is retained for 90 days. No ads, no in-app purchases, no third-party SDKs.

1.0.0 update: • Practice now has a New / Review switch: answer unseen questions or revisit ones you've completed. • Swipe left or right during practice to move between questions. • Fixed an issue where a multiple-choice explanation could appear for a different question. • Complete five-part course: 106 knowledge cards, 30 practice sets, 237 multiple-choice and 91 free-response questions.