Descriptive Statistics · 45 lessons

An average is a single number standing in for many, and the whole topic is about what that substitution costs. Two data sets can share a mean and have nothing else in common — which is why every serious statement about data quotes a center and a spread.

1. 1Reading Pictograms
2. Pictograms (10)
3. 2Reading Bar Charts
4. Bar charts (10)
5. 3Reading Tables
6. 4Line Graphs
7. 5Line Plots in Halves and Fourths
8. Tables and line graphs (11)
9. 6The Mean
10. 7Categorical and Numerical Data
11. 8Bar Charts
12. 9Pie Charts
13. 10Dot Diagrams
14. 11Vertical Line Charts
15. 12Stem and Leaf
16. 13Tally and Frequency Tables
17. 14Two-Way Tables
18. 15Frequency Trees
19. 16Histograms
20. 17Frequency Density
21. 18Choosing a Chart
22. 19Misleading Graphs
23. Statistical displays (11)
24. 20Median and Mode
25. 21Measures of Central Tendency
26. 22Averages from a Frequency Table
27. 23Mean of Grouped Data
28. 24The Modal Class
29. 25Range and IQR
30. 26Measures of Spread
31. 27Cumulative Frequency
32. 28Quartiles from the Curve
33. 29Percentiles
34. 30Box and Whisker
35. 31Judging Normality from a Box Plot
36. 32Mean Absolute Deviation
37. 33Standard Deviation
38. 34Standard Deviation: Ungrouped
39. 35Standard Deviation: Grouped
40. 36Comparing Data Sets
41. 37Simpson’s Paradox
42. 38Finding a Frequency from the Mean
43. Measuring Data (12)
44. 39Scatter Plots
45. 40Correlation
46. 41Line of Best Fit
47. 42Choosing Between Two Models
48. 43Interpolation and Extrapolation
49. 44Time Series
50. 45Correlation Is Not Causation
51. Scatter Plots and Correlation (10)