Laboratory
Hands-on experiments in statistics and data science.
Try it now
Central limit theorem
Watch averages turn into a bell curve.
Runs test
Check if a sequence is truly random.
Ball Lab
Draw colored balls and test the odds.
Card Lab
Draw playing cards and test the odds.
Dice Lab
Roll dice and answer any probability question.
Box Plot Lab
Build box plots and see how quartiles work.
Sampling Lab
Explore sampling methods, select random samples, and see how sample statistics vary.
Distribution Lab
Solve real-world probability problems with six distributions.
Regression Lab
Fit a line, drag points, and read the results.
Regression Diagnostics Lab
Break regression assumptions, spot the damage, then fix it.
Demography Lab
Project a population pyramid and compute birth and death rates.
Neural Network Lab
Build a neural network, adjust weights and biases, and explore how it learns.
Tables
Runs test table
Critical values for n1 and n2 from 2 to 20.
Z table
Standard normal (Z) areas to the left of Z, from -3.9 to 3.9.
Coming soon
Bootstrap intervals
Resample data to measure uncertainty.
Law of large numbers
Watch averages settle on the truth.
Correlation explorer
Move points and watch r change.
K-means playground
Group points into clusters, step by step.