Centre, spread and outliers

What this note covers

1. Locate centre in an ordered set
2. Measure spread and identify outliers
3. Calculate standard deviation correctly
4. Compare two groups fairly
5. Read skew and sensitivity
6. Present an examined comparison
7. Worked delivery times: centre, quartiles, fences and standard deviation
8. Worked team comparison: equal means, unequal spread and fair interpretation

8 sections · 10 key terms & formulas · 6 common mistakes