| When | Change | Evidence | Session |
|---|---|---|---|
| 2026-10-05 | Secure → Secure | Same item as P4-P5 today (Q6): a relative-frequency estimate of 1/3 from 12 rolls criticised as too few rolls, unaided, 1/1 — the estimate-wording question owed after a gap (last check 22 Sep, 13 days). | session 71 |
| 2026-09-22 | Secure → Secure | 22 Sep, non-calc, 13 days after last check: pin 150/200 → 3/4 estimate and 750 expected in 1000, both correct, answer only. Calculation half automatic; estimate wording not tested today. | session 38 |
| 2026-09-10 | Secure → Secure | 9 Sep starter: dice rolled 60 times, lands on 3 fifteen times, claim of 1/4. Gave both the sample-size and estimate-wording criticisms unprompted, second session running. | session 17 |
| 2026-09-08 | Developing → Secure | 8 Sep starter: vet weighs 40 puppies, 6 underweight, claims 0.15. Gave BOTH criticisms unprompted — sample too small, and it should be stated as approximately 0.15 or as an estimate. Third time asked, first time landed, after failures on 2 and 7 Sep. Calculation half evidenced independently across four separate sittings. | session 11 |
| 2026-09-07 | Developing → Developing | 7 Sep starter Q5: company claims P(faulty) = 0.04 from 2 faulty in 50. Small-sample criticism given correctly; could not produce the second criticism and said "I don't know". Second failure of the estimate-wording point after Aaron on 2 Sep. | session 7 |
| 2026-09-07 | Developing → Developing | 4 Sep starter: biased spinner 24/150 → 4/25, correct and simplified. Second independent relative-frequency question, differently framed. Practice Q4/Q5 now completed (see amended session 3). | session 6 |
| 2026-09-03 | Gap → Developing | Taught 2 Sep. Expected frequency: 300 rolls → 50, and 0.15 × 400 → 60 non-calculator via 40 + 20, both correct. Relative frequency: drawing pin 130/200 → 13/20 simplified unprompted, then 650 in 1000. Practice Q1 45 heads and Q2 9 late trains correct; Q3 expected blues 75 correct. Taught and practised in one session with support, so developing. | session 3 |
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