---
id: "prereq-blooms-two-sigma"
type: "prereq"
source_timestamps: ["00:02:58"]
tags: ["educational-theory"]
related: ["concept-blooms-two-sigma", "claim-human-ai-collaboration-best"]
reason: "Required to understand why AI tutors represent a paradigm shift in educational efficacy rather than just a marginal improvement."
sources: ["s10-vibe-codes"]
sourceVaultSlug: "s10-vibe-codes"
originDay: 10
---
# Understanding of Bloom's 2-Sigma Problem

## Prerequisite

The audience needs working familiarity with Bloom's 2-sigma problem — the historical finding that 1-on-1 tutoring is the gold standard of education but was economically unscalable. See [[concept-blooms-two-sigma]] for the full treatment.

## Why It Is A Prerequisite

Without this background, the talk's claims about AI tutors look like incremental edtech improvement. With it, the claims become correctly framed as a paradigm shift: AI is removing the historical economic constraint that made the gold standard unreachable.

## Quick Mental Model

- 1-on-1 tutoring → +2 standard deviations of learning vs. classroom
- Economic constraint → impossible to give every child a tutor
- AI removes the constraint → see [[entity-product-khanmigo]] at 1.4M users
- Therefore [[claim-human-ai-collaboration-best]] is not surprising — it is what scaled tutoring should produce