Inference Regression And Statistical Tests calculators
27 calculators Linear Regression Calculator Fit a least-squares line to your data. Get slope, intercept, r², standard errors, t-statistics, p-values, F-statistic, and a predicted y with confidence interval.
Open Margin of Error Calculator Calculate survey margin of error with optional finite population correction. Reverse-solve for the sample size you need and see how MOE changes as n grows.
Open P-Value Calculator Find the p-value from a Z, t, chi-square, or F test statistic. Choose left-, right-, or two-tailed tests and check significance at any alpha level.
Open T-Test Calculator Run a one-sample, two-sample, or paired t-test online. Get the t statistic, p-value, critical value, 95% CI, and Cohen's d effect size instantly.
Open Z-Test Calculator Run a one-sample, two-sample, or proportion z-test. Get the z-score, p-value, critical value, and confidence interval with one-tailed or two-tailed options.
Open A/B Test Calculator Calculate A/B test statistical significance, p-value, z-score, conversion uplift, observed power, and required sample size. Free, instant, and shows your work.
Open A/B Test Calculator Free A/B test calculator: check statistical significance with p-value and z-score, or plan your test with sample size estimation, MDE, and power analysis.
Open Absolute Uncertainty Calculator Calculate absolute uncertainty from percentage, relative, or repeated-measurement data. Includes quadrature propagation rules for add, subtract, multiply, and divide.
Open Coefficient of Determination Calculator (R-squared) Calculate R-squared (R2) from x and y data. Get coefficient of determination, Pearson r, SSE, SSR, SST, regression line equation, and a plain-English interpretation.
Open Critical Value Calculator Find the critical value for Z, t-Student, chi-square, or F distributions. Supports one-tailed and two-tailed tests, with the rejection region and a worked explanation.
Open Cubic Regression Calculator Free cubic regression calculator: enter x,y data points to instantly fit a third-degree polynomial, get coefficients a,b,c,d, R-squared, RMSE, and a curve chart.
Open Degrees of Freedom Calculator Calculate degrees of freedom for one-sample t-tests, Welch's t-test, chi-square, one-way ANOVA, F-test, and linear regression. Step-by-step formulas shown.
Open Exponential Regression Calculator Enter your (x, y) data pairs to fit an exponential regression model y = a*b^x. Get coefficients a and b, R-squared, doubling/half-life time, and a prediction for any x.
Open F-Statistic Calculator Compute the F-statistic, p-value, and critical value for a variance F-test or regression Wald test. Step-by-step working with a decision at your chosen alpha level.
Open Fisher's Exact Test Calculator Free Fisher's exact test calculator. Enter your 2x2 table to get the exact p-value (one- and two-tailed), odds ratio, 95% CI, and relative risk instantly.
Open Mann-Whitney U Test Calculator Free Mann-Whitney U test calculator. Enter two groups of data and get the U statistic, z-score, p-value, effect size (r), and a full step-by-step rank table.
Open McNemar's Test Calculator Free McNemar's test calculator for paired binary data. Get the chi-square statistic, exact p-value, continuity correction, odds ratio, and 95% CI in seconds.
Open Normal Approximation to Binomial Calculator Calculate binomial probabilities using the normal approximation with continuity correction. Supports P(X=k), P(X<=k), P(X>=k), P(a<=X<=b) and more, with step-by-step working.
Open Point Estimate Calculator Calculate the best point estimate for a population proportion using MLE, Wilson, Laplace, and Jeffrey methods. Enter successes and trials - see results instantly.
Open Polynomial Regression Calculator Fit a polynomial curve (degree 1-6) to your x,y data. Get the equation, R-squared, adjusted R-squared, RMSE, a fitted-values table, and a scatter plot.
Open Quadratic Regression Calculator Find the best-fit quadratic curve for your data. Get the equation y = ax² + bx + c, R-squared, vertex, axis of symmetry, and a step-by-step solution.
Open Raw Score Calculator Convert a z-score to a raw score instantly. Enter mean, SD, and either value to get the other, plus the percentile rank and two-tailed p-value.
Open Relative Error Calculator Calculate relative error, absolute error, and percent error. Reverse-solve for any missing value. Formula, worked example, and error-severity reference table.
Open Residual Calculator Calculate a single residual (observed minus predicted) or fit a simple linear regression and get every residual, SSE, R-squared, RMSE and MAE instantly.
Open Sampling Error Calculator Calculate sampling error for proportions or means. Supports z and t distributions, finite population correction, and confidence intervals from 80% to 99.9%.
Open T-Statistic Calculator: t-Value, p-Value and Critical Value Calculate the t-statistic, p-value, degrees of freedom and critical value for one-sample, two-sample (Welch) and paired t-tests. Shows every step of the math.
Open Wilcoxon Rank-Sum Test Calculator Free Wilcoxon rank-sum test calculator. Enter two independent samples and get W, U statistic, z-score, p-value, and effect size r with a step-by-step ranking solution.
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