Includes bibliographical references.

1. Using everyday numbers is easy 5
2. Discoveries sing everyday techniques 1:
3. Do we have enough teachers? 20
4. Summanr 29
5. 2 judgement with everyday numbers 31
6. The likely sources of error 31
7. How big is a 'difference', and other ssues? 35
8. "effect' sizes? 38
9. How unfair is an inequality, and related
10. Questions? 13
11. Discoeries using everyday techniques 2:
12. Is there a school effectt 50
13. Summary 58
14. 3 defending the use of everday numbers 59
15. Not four levels of measurement 60
16. Not the standard deviation 63
17. Not significance testing 73
18. Not a supt-populataon 78
19. Not multiviate statstics 79
20. Judgement not calculus 83