Comprehensive statistical analysis tools for students, researchers, and professionals. Calculate descriptive statistics, confidence intervals, hypothesis tests, regression analysis, and probability distributions with interactive visualizations - all completely free.
Calculate mean, median, mode, standard deviation, and variance from your data
Compute confidence intervals for means, proportions, and variances
Perform t-tests, z-tests, and chi-square tests on your data
Analyze relationships between variables with scatter plots and regression lines
Evaluate PDFs, CDFs, and quantiles for common probability distributions
Apply various grading curves to exam scores and visualize grade distributions
All calculations use numerically stable algorithms for accurate results.