Build a dataset by clicking a number line and watch mean, median, MAD, standard deviation, quartiles, IQR and outliers update live. Toggle Β±Ο bands and the 1.5ΓIQR fences, load class presets, and work the built-in challenges.
Click anywhere on the number line to add a dot, click a dot to remove it, or drag it to move it. Every statistic recomputes instantly. Toggle the Β±1Ο/Β±2Ο bands and the outlier fences to see how mean-based spread (SD, MAD) and quartile-based spread (IQR) respond to the same data.
Pair it with the Standard Deviation and Spread activities: load Class A then Class B to show identical means with different spread, or chase the challenge to make Ο much bigger than MAD and see how a single extreme value drives the standard deviation.