The Coach Who Yelled
The idea: after an unusual result, the next one is usually more ordinary, whatever you do in between.
Read it
Who is in this book
- Kiran Two things moving together is not one causing the other from InferForge
- Danya a child of the Green Asks "how do we know?"
- Sofia The spread matters as much as the average — every team has high and low days from InferForge
- Yara Only a fair, random test can show what a choice really does from InferForge
- Tara a child of the Green Listens longest, speaks last
Every recurring character has a short tune, so you can tell who is on stage before a word is said. The tunes play only when you tap, and the Reading Access sound switch turns them off.
The Honest Page
Which parts of this story are true, stretched or made up?
True
- The team's twelve scores average about 61. After each of the three worst games, the next score was higher (by 14, 19 and 7); after each of the three best, the next was lower (by 17, 13 and 13).
- An unusually high or low result tends to be followed by one closer to the average. This is called regression to the mean. Source
- Daniel Kahneman described flight instructors who believed that criticising a bad landing improved the next one and praising a good one made the next worse, when the pattern came from regression to the mean. Source
- Letting chance decide who gets a treatment, then comparing, is how scientists tell whether the treatment itself made the difference. Source
Stretched
- In the case, Sofia says part of a very bad or very good game is luck. What we simplified: 'Luck' stands for everything outside the team's control that varies from game to game. Real games also have real causes, and a fair test is the way to separate the two.
Made up
- Coach Brennan, the team, the meeting and the scores are made up. The pattern in the scores was chosen to show the idea; it is not data.
Corrections
When a book gets something wrong, we fix it and say so here.
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2026-10-07
Was:
Danya written as a girl (she, her) in parts of Tara's Casebook (cases 1, 2, 4, 5, 7, 8; case 3's 'her teacher').Now: Danya is a boy (he, his) in every case, as in every other book on the Green.
The same Spark is the same child everywhere (green/sparks.yaml).
Found by the hub, writing Danya's own series (P#223 S4) · now guarded by a Spark pronoun check (check_story_world.py).
Tara’s sentence
The case stops where Tara speaks. Write the sentence you would have said. It stays on this device.
Kept.
Your sentence lives on this device. Nothing is sent anywhere.
Ring the hammer for someone
Pick this book for someone younger. The link carries only the book, and it will wait for them on the Green.