Statistics

Build intuition for randomness and data. Shape distributions, watch sample means converge, and fit lines to scattered points.

Key concepts

Distributions

Describe how likely each value of a random quantity is

Center and Spread

Mean, median and standard deviation summarize where data sits and how much it varies

Sampling

Averages of random samples behave predictably even when the population does not

Regression

Model the relationship between variables with a best-fit line

Visualizations

Normal Distribution

Beginner

Adjust the mean and standard deviation of the bell curve and measure the area under it

Bell CurveStandard DeviationZ-Scores68-95-99.7 Rule
Open

Central Limit Theorem

Intermediate

Draw repeated samples and watch the distribution of sample means become normal

SamplingSample MeanStandard Error
Open

Linear Regression

Intermediate

Place points and see the least-squares line, residuals and R² update live

Least SquaresResidualsCorrelationR²
Open