Ο Statistics & Probability Calculators
Descriptive statistics, probability distributions and inference tools for students, researchers and analysts. Paste data straight from a spreadsheet β values may be separated by spaces, commas or new lines.
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- Descriptive Statistics CalculatorCalculate mean, median, mode, standard deviation, variance, quartiles, IQR, range, skewness and more from a list of numbers.
- Normal Distribution & Z-Score CalculatorCompute z-scores and normal distribution probabilities P(X < x), P(X > x) and P(xβ < X < xβ) for any mean and standard deviation.
- Inverse NormalFind the value x and z-score for a given cumulative probability or percentile in a normal distribution.
- Binomial Distribution CalculatorBinomial probability calculator: P(X = k), P(X β€ k), P(X β₯ k), mean and variance for n trials with success probability p.
- Poisson Distribution CalculatorPoisson probability calculator: P(X = k), P(X β€ k) and P(X β₯ k) for events occurring at average rate Ξ».
- Confidence Interval CalculatorConfidence interval for a mean using Student's t (or z) from sample mean, standard deviation and sample size.
- Sample Size CalculatorDetermine the sample size needed for a survey or study for a given confidence level, margin of error and population size.
- Linear Regression & Correlation CalculatorLeast-squares linear regression: slope, intercept, Pearson correlation r, RΒ² and prediction from paired x and y data.
- One-Sample & Two-Sample t-Test CalculatorRun a one-sample t-test against a hypothesised mean, or Welch's two-sample t-test, with t statistic, degrees of freedom and p-value.
- Probability CalculatorCompute P(A and B), P(A or B), P(not A), P(A xor B) and conditional probabilities for independent events.