Statistics and data

Statistics is the math of finding out what is true from a pile of facts. You collect data, sort it, draw it, and boil it down to a few honest numbers: what is typical, how spread out things are, and how sure you can be.

Step	Page	You will be able to
Play	Counting, sorting and charts	Run a survey, keep a tally and draw a bar chart that answers a question
Explore	Averages: mean, median and mode	Find the typical value three ways, and the range, and choose the fair one
Build	Spread: how far from the middle	Use quartiles, box plots, outliers and the standard deviation
Master	Distributions and the normal curve	Read the shape of data, use the 68–95–99.7 rule and compare with z-scores
Beyond	Reading data honestly	Spot bias and misleading graphs, measure correlation, fit a line and meet Simpson's paradox