T-tests within each experiment found no significant advantage for the contrast-based experimental group over the control groups in long-term gain¶
Claim · All claims
Evidence · 1 study (2 entries) · designr3·q3
Currency · newest study 2011 · not yet checked against its sources · 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.
q3 i? In experiment 1 the experimental group A2 showed a larger long-term gain, but the difference did not reach significance, t(51) = 1.30, p < .2. → Mona Holmqvist 2011
q3 i? In experiments 2 and 3 there was no significant difference between groups (t(62) < 1, N.S.; t(46) < 1, N.S.). → Mona Holmqvist 2011 (2)
Evidence¶
Mona Holmqvist 2011¶
Mona Holmqvist. (2011). Teachers' learning in a learning study. Instr Sci 39:497–511. https://doi.org/10.1007/s11251-010-9138-1
q3 · i? · design · r3
T-test for independent groups comparing the collapsed control treatments with the experimental group in learning study A; no significant advantage for the contrast-based group. Equivalence was not tested.
"In experiment 1, the experimental group (A2) showed a larger long-term gain, but the difference did not reach significance (t [51] = 1.30; p\ .2)."
Mona Holmqvist 2011 (2)¶
Mona Holmqvist. (2011). Teachers' learning in a learning study. Instr Sci 39:497–511. https://doi.org/10.1007/s11251-010-9138-1
q3 · i? · design · r3
Per-experiment t-tests: in experiment 2 no tendency towards a difference between groups, t(62) < 1, N.S.; in study 3, long-term gain was again larger in the experimental group C1, although not significantly so, t(46) < 1, N.S. Equivalence was not tested.
"In experiment 2, there was no tendency towards a difference between the groups ( t [62] \ 1; N.S.)."
Discussion¶
Related Claims¶
- Lessons using contrasts between critical aspects produced greater long-term retention than the other lessons in each learning study cycle, though not significantly so in individual experiments — possibly the same claim (merge candidate)
- In a hypothetical trial, responder rates differed greatly between treatment and control groups, with the treatment group showing higher rates in positive-gain categories — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
t-tests-no-significant-contrast-advantage |
title |
T-tests within each experiment found no significant advantage for the contrast-based experimental group over the control groups in long-term gain |
description |
T-tests within each experiment found no significant advantage for the contrast-based experimental group over the control groups in long-term gain |
status |
review |
evidence_strength |
weak |
newest_evidence |
2011 |
generated |
by process:wiki-ingest on 2026-10-18 |
trust |
unverified — no one has confirmed this page's content |
sources |
2 — mona-holmqvist-2011, mona-holmqvist-2011-2 |
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