Chambers et al. report a statistically significant expressive language effect for 3-year-olds but not 4-year-olds, which WWC recalculation does not confirm¶
Claim · All claims
Evidence · 1 study · causalr2·q2
Currency · newest study 2009 · checked against its sources 2026-10-17 (automated, 1 of 1 entry) · not reviewed by a person
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.
q2 i? The study authors report a statistically significant effect on MSEL Expressive Language for 3-year-old children but not for 4-year-old children; WWC calculations find the differences not statistically significant for either age group. → Curiosity Corner 2009
Evidence¶
Curiosity Corner 2009¶
Curiosity Corner. (2009). WWC Intervention Report, What Works Clearinghouse, U.S. Department of Education. https://www.successforall.org/early/early_curiosity.htm
q2 · i? · causal · r2
Quasi-experimental study (Chambers et al., 2001) analyzing MSEL Expressive and Receptive Language scales separately for 3-year-olds in private centers and 4-year-olds in public schools. The authors' reported effect size of 0.36 for 3-year-olds met WWC's substantively important threshold, but WWC calculations found it not statistically significant.
"The authors report a statistically significant effect of Curiosity Corner on Expressive Language for 3-year-old children but not for 4-year-old children."
Discussion¶
Learner Variables¶
- Communication Skills — outcome: instruction changes it
- Oral Language — outcome: instruction changes it
Related Claims¶
- Curiosity Corner shows no discernible effects on cognition in the Chambers et al. quasi-experimental study — related
- Curiosity Corner shows no discernible effects on preschool oral language outcomes across two studies meeting WWC standards — related
- Statistically significant effects reported by the CDP studies were not statistically significant as recalculated by the WWC — related
- Head Start shows no discernible effects on mathematics achievement for 4-year-old children — related
- Nunnery and Ross (2007) reported significant grade 5 but not grade 8 TAAS effects, which were non-significant in WWC recalculation — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
curiosity-corner-expressive-language-age-group-mixed |
title |
Chambers et al. report a statistically significant expressive language effect for 3-year-olds but not 4-year-olds, which WWC recalculation does not confirm |
description |
Chambers et al. |
status |
review |
evidence_strength |
mixed |
newest_evidence |
2009 |
source_checked |
2026-10-17 |
generated |
by process:wiki-ingest on 2026-10-07 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — curiosity-corner-2009 |
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