Alpha of knowledge tests increases after interventions from pretest to posttest¶
Claim · All claims
Evidence · 1 study · quant-synthesisr2·q3
Currency · newest study 2025 · not yet checked against its sources · not reviewed by a person · recheck by 2028: tool and model accuracy changes quickly
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Alpha increases in intervention studies from before to after learning, from 0.77 at T1 to 0.84 at T2 (p = .020). → Peter A. Edelsbrunner 2025
Evidence¶
Peter A. Edelsbrunner 2025¶
Peter A. Edelsbrunner, Bianca A. Simonsmeier, Michael Schneider. (2025). The Cronbach’s Alpha of Domain‑Specific Knowledge Tests Before and After Learning: A Meta‑Analysis of Published Studies. Educational Psychology Review. https://doi.org/10.1007/s10648-024-09982-y
q3 · i? · quant-synthesis · r2
Meta-regression from Table 2 controlling for log-centered test length. Intervention studies showed Alpha increasing from T1 (.77) to T2 (.84), p = .020, supporting Hypothesis 8 that "Alphas increase in intervention studies from before to after learning."
"T1 33 53 .77 [.72, .81] [.30; .93] ref 0.35 96.96 T2 30 48 .84 [.79, .88] [.51; .95] .020 0.65 98.27"
Discussion¶
Related Claims¶
- Under a dominant α-process, the normalized gain contains no pretest-score term and is uncorrelated with pretest score if α is uncorrelated with pretest score — related
- Cronbach's Alphas of knowledge tests vary widely, with a 90% prediction interval of (0.35, 0.96) — related
- Alpha is negatively related to sample mean age, and knowledge type shows no effect after controlling for test length — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
knowledge-test-alpha-increases-after-intervention |
title |
Alpha of knowledge tests increases after interventions from pretest to posttest |
description |
Alpha of knowledge tests increases after interventions from pretest to posttest |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2025 |
recheck_by |
2028 |
generated |
by process:wiki-ingest on 2026-10-19 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — peter-a-edelsbrunner-2025 |
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