Calculators

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Descriptive statistics

Descriptive statistics
Mean, median, spread and a histogram.

Hypothesis tests

One-sample t-test
Compares a sample mean against a known value.
Two-sample t-test
Compares the means of two independent groups.
Paired t-test
Compares two measurements of the same subjects.
One-way ANOVA
Compares the means of three or more groups.
Chi-square: independence
Tests whether two categorical variables are related.
Chi-square: goodness of fit
Tests whether observed frequencies match the expected ones.

Correlation and regression

Correlation and regression
The relationship between two variables and a linear model.

Probability distributions

Normal distribution
A continuous, symmetric distribution.
Binomial distribution
The number of successes in n independent trials.
Poisson distribution
The count of rare events in a fixed interval.