Currently Secure · last touched 2026-10-05
| When | Change | Evidence | Session |
|---|---|---|---|
| 2026-10-05 | Secure → Secure | Mixed round Q6, non-calc, unaided: dice rolled 12 times, 4 sixes, 'explain why the estimate may not be reliable' → 'the estemat is not reliable because the amont of roles is not big enoph'. Correct small-sample reason, 14 days after the last sample-size item (21 Sep). | session 71 |
| 2026-10-02 | Secure → Secure | Mixed set Q1 unaided, non-calc: P(red) 0.35, P(blue) 0.4 → '1 - 0.35 = 0.65, 0.65 - 0.4 = 0.25, p = 0.25'; every working line before the answer. | session 65 |
| 2026-09-28 | Secure → Secure | 28 Sep, non-calc: P(green) from P(red) 0.2, P(blue) 0.5 → '0.2 + 0.5 = 0.7, 1 - 0.7 = 0.3, so p(green) = 0.3' ✓ with every line written unasked. | session 49 |
| 2026-09-21 | Secure → Secure | audit: bar met in session 34 — small-sample reasoning retested and closed: 7 heads in 10 flips judged not biased, unprompted, plus an unprompted expected-value comparison point. | standalone |
| 2026-09-21 | Secure → Secure | 21 Sep starter: 7 heads in 10 flips, 'biased' claim — gave small-sample reason unprompted plus '7 is only 2 more than the expected amount'. The small-sample reasoning loose end from 4 Sep is retested and closed. | session 34 |
| 2026-09-11 | Developing → Secure | 11 Sep starter: council surveying 25 people at a bus stop — gave both the sample-size and the location-bias criticisms when only one was asked. Third session running with correct sampling reasoning. | session 19 |
| 2026-09-10 | Developing → Developing | 9 Sep starter: fourth flavour 0.3, with 0.3+0.25+0.15 = 0.7 then 1 − 0.7 written out as separate steps rather than done mentally. | session 17 |
| 2026-09-08 | Developing → Developing | 8 Sep starter: gave "40 puppies is too small a sample" as a criticism unprompted — the sample-size reasoning that was the weak half on 4 Sep. | session 11 |
| 2026-09-07 | Developing → Developing | 7 Sep starter: spinner with red 0.2, blue 0.3 and two equally likely colours → P(green) = 0.25. Two-step, correct, independent. | session 7 |
| 2026-09-07 | Gap → Developing | Taught 4 Sep. 1 − P(A) correct on decimals and fractions incl. 5/12 via common denominator unprompted; 0.35 × 60 = 21. Exit ticket 4/5 — Q4 correct only after a prompt, Q5 answered the wrong question. Taught and tested same session. | session 6 |
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