Claim

The same supervised ed-tech intervention raised mathematics achievement by nearly half a standard deviation over 31 weeks, with gains across achievement levels and question difficulty.

Type QUANTITATIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 22042 · qualifiers {"location":"83 residential government middle schools in Uttar Pradesh, India.","time_range":"31-week field experiment."}

Referenced 77 times: checked 1, looked up by assistants 0, viewed 60, shared 16. A count of attention, not evidence.

Topics

Education · 1efd24fe Technology · 1efd24fe

Assessment

Supported

Score: 0.8808 under ledger-default@0.3.0 at snapshot 27745

1 of 4 review checks done · 1 counted

1 independent evidence lineage · review checks 1 of 4 · stability MEDIUM

Main unresolved issue: 2 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:be277ae0-f2c2-8654-bc6e-6a0c35f5997d

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.

Why?

Strongest counted support: The primary study reports usage rising from 7.2 to 47.4 minutes weekly and mathematics achievement increasing nearly half a standard deviation. weight 2.000000 evidence

Suppressed as dependent: The excerpt directly reports nearly half-standard-deviation mathematics gains over 31 weeks across achievement levels and question difficulty.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

Hide calculation

0.8808 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability MEDIUM · 2 sources, 1 independent lineage

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:218892f3fa898866df0aff51182c199c9fa241fba8c12334768a7b9f793ad16e

Last changed at entry seq 24994; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
92597437 support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	0.000000 (dependent strongest only, kept 979fab5a)
979fab5a support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000

prior 0.50 → log-odds 0.000000 + 2.000000 (the counted weights) = 2.000000 → probability 0.8808

Under neighbouring settings of the same model: 0.8022 to 0.9309, a spread of 0.1287.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

“A randomized field experiment in 83 government middle schools in Uttar Pradesh found that dedicated implementation staff increased Khan Academy use and...” · 2 claims · 29 September 2026

Evidence for

The primary study reports usage rising from 7.2 to 47.4 minutes weekly and mathematics achievement increasing nearly half a standard deviation.

From How In-School Supervised Ed-Tech Support Produces Massive Learning Gains: A Khan Academy Field Experiment in India Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The excerpt directly reports nearly half-standard-deviation mathematics gains over 31 weeks across achievement levels and question difficulty.

From How In-School Supervised Ed-Tech Support Produces Massive Learning Gains: A Khan Academy Field Experiment in India Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
34bc4708		979fab5a

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

1 check by this claim's own author, alongside the independent review above. 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	92597437, 979fab5a

Summary

Supported. The main support is: The primary study reports usage rising from 7.2 to 47.4 minutes weekly and mathematics achievement increasing nearly half a standard deviation. 94292458

1 further item repeats the same origin and is not independent evidence. 34bc4708

Review checks: 1 of 4. coverage:be277ae0-f2c2-8654-bc6e-6a0c35f5997d

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
22042	APPENDED
22043	ACCEPT	AUTOMATIC_AFTER_VALIDATION
22054	LINK_EVIDENCE	by 1efd24fe (accepted)
24886	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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      "group": null,
      "reason": "dependent_strongest_only",
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      "extraction": "UNVERIFIED",
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      "group": null,
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      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
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    "permissive": "0.9309",
    "conservative": "0.8022"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "QUANTITATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.8808",
  "provisional": true,
  "evidence_sum": "2.000000",
  "snapshot_seq": 24994,
  "prior_log_odds": "0.000000",
  "support_groups": 1,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
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      "ok": false
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    "independence_reviewed": {
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      "ok": false
    },
    "primary_source_reviewed": {
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      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "2.000000",
  "not_applicable_reason": null,
  "independence_unreviewed": 2
}