Wolfram|Alpha Statistics Calculators

Wolfram|Alpha has statistics calculators. Solve problems related to betting, the birthday problem, confidence intervals, descriptive statistics, event probability, hypothesis tests, learning curves, medical statistics, modeling, population, probability distributions, regression, standardization, statistical errors and variance.

Statistics

Betting
Hitting Streak Probabilities CalculatorLog Odds Ratio CalculatorOdds Ratio Calculator
Birthday Problem
Birthday Problem CalculatorBirthday Problem with Leap Years CalculatorChance of Having a Given Birthday Calculator
Confidence Intervals
Agresti–Coull Confidence Interval for a Binomial Parameter CalculatorClopper–Pearson Confidence Interval for a Binomial Parameter CalculatorConfidence Interval for the Difference between Two Binomial Parameters CalculatorConfidence Interval for the Difference between Two Population Means CalculatorConfidence Interval for the Standard Deviation of a Normal Population CalculatorConfidence Interval for the Variance of a Normal Population Calculatort‐Interval for a Population Mean Calculatort‐Interval for the Difference between Two Population Means CalculatorZ‐Interval for a Population Mean CalculatorJeffreys Confidence Interval for a Binomial Parameter CalculatorPlus‐Four Confidence Interval for a Binomial Parameter CalculatorPlus‐Four Confidence Interval for the Difference between Two Binomial Parameters CalculatorSimple t‐Interval for the Difference between Two Population Means CalculatorStandard Confidence Interval for a Binomial Parameter CalculatorWilson Score Confidence Interval for a Binomial Parameter with Continuity Correction Calculator
Descriptive Statistics
Geometric Mean CalculatorKurtosis CalculatorMean CalculatorMedian CalculatorMode CalculatorPeriodic Function Root Mean Square CalculatorRoot Mean Square CalculatorSkewness Calculator
Event Probability
Complement Probability CalculatorConditional Probability CalculatorDefects per Million Opportunities CalculatorDefects per Unit CalculatorNumber of Distinct Categories CalculatorParts per Million Defective CalculatorPart Variation CalculatorProbability of the Union of Three Events CalculatorProbability of the Union of Three Independent Events CalculatorProbability of the Union of Two Events CalculatorProbability of the Union of Two Independent Events CalculatorRepeatability and Reproducibility CalculatorRepeatability—Equipment Variation CalculatorReproducibility—Appraiser Variation CalculatorTotal Variation Calculator
Hypothesis Tests
F‐Test for the Equality of Two Variances Calculatort‐Based Hypothesis Test for the Difference between Two Population Means Calculatort‐Test for a Population Mean Calculatorz‐Test for a Population Mean CalculatorNormal Based Hypothesis Test for the Difference between Two Population Means CalculatorProportion Difference Test CalculatorProportion Test CalculatorSimple t‐Based Hypothesis Test for the Difference between Two Population Means Calculator
Learning Curve
Crawford's Model Learning Curve CalculatorWright's Model Learning Curve Calculator
Medical Statistics
Bias & PrevalenceMedical Statistics ToolsOverall Classification PerformancePerformance MetricsPredictive Value & Likelihood Ratios
Modeling
SI Compartmental Model of Infectious Disease Spread CalculatorSIR Compartmental Model of Infectious Disease Spread CalculatorSIS Compartmental Model of Infectious Disease Spread Calculator
Population
Logistic Equation CalculatorProbability of Exceedance CalculatorSample Size for Estimating a Binomial Parameter CalculatorSample Size for Estimating a Population Mean CalculatorSlovin's Formula Calculator
Probability Distributions
Probabilities for the Binomial Distribution CalculatorProbabilities for the Chi‐Squared Distribution CalculatorProbabilities for the F‐ratio Distribution CalculatorProbabilities for the Geometric Distribution CalculatorProbabilities for the Hypergeometric Distribution CalculatorProbabilities for the Negative Binomial Distribution CalculatorProbabilities for the Normal Distribution CalculatorProbabilities for the Poisson Distribution CalculatorProbabilities for the Student's t‐Distribution CalculatorValues of the Chi‐Squared Probability Density Function CalculatorValues of the F‐ratio Probability Density Function CalculatorValues of the Normal Probability Density Function CalculatorValues of the Student's t‐Distribution Probability Density Function Calculator
Regression
Cubic Fit CalculatorExponential Fit CalculatorInterpolating Polynomial CalculatorLinear Fit CalculatorLogarithmic Fit CalculatorQuadratic Fit Calculator
Standardization
t‐Score CalculatorZ‐Score Calculator
Statistical Error
Percent Difference CalculatorPercent Error Calculator
Variance
Coefficient of Variation CalculatorSample Variance CalculatorStandard Deviation Calculator