Statistics
Where statistics show up in real life
4 live exhibits. Each one already works. Change a number and see what happens.
Open as board Play with these together. Solving one grows related exhibits.
StatisticsMean vs. median: why one big paycheck skews the average
Add one huge salary and the average jumps. The median, the middle value, barely moves.
StatisticsThe bell curve: what percentile is that?
Count standard deviations from the average (the z-score), and the bell curve tells you what share falls below.
StatisticsPoll margin of error: why about 1,000 people gives ±3%
The margin shrinks with the square root of the sample. Four times the people only halves it.
StatisticsA/B test: is version B really better, or just lucky?
A higher conversion rate might be chance. The z-test turns the gap and the sample size into a p-value.