Prior knowledge significantly predicted algebra posttest scores and learning gains, with high-prior-knowledge students scoring higher and low-prior-knowledge students gaining more¶

Claim · All claims
Evidence · 1 study (2 entries) · causal r1 · q2
Currency · newest study 2025 · checked against its sources 2026-10-27 (automated, 2 of 2 entries) · not reviewed by a person

Subclaims¶

q2 i? Two-way ANOVA showed a significant main effect of prior knowledge on posttest scores, with HPK students outscoring LPK peers. → Man Su 2025 q2 i? Prior knowledge also had a significant main effect on learning gains, with LPK students showing greater improvements due to lower baseline scores. → Man Su 2025 (2)

Evidence¶

Man Su 2025¶

Man Su, Belle Dang, Andy Nguyen & Tomohiro Nagashima. (2025). Choice-making in an adaptive learning system with motivational pedagogical agents. npj Science of Learning. https://doi.org/10.1038/s41539-025-00366-7

q2 · i? · causal · r1

Two-way ANOVA on posttest scores in the 49-student classroom study, with condition (Agent vs. Non-Agent) and prior knowledge (HPK vs. LPK) as factors. Prior knowledge was a significant main effect; the condition main effect and the condition × prior knowledge interaction were not significant.

"Results indicated a signi ficant main effect of prior knowledge on posttest scores, F(1, 45) = 16.93,p < 0.001, showing that HPK students achieved significantly higher posttest scores compared to LPK peers."

Man Su 2025 (2)¶

Man Su, Belle Dang, Andy Nguyen & Tomohiro Nagashima. (2025). Choice-making in an adaptive learning system with motivational pedagogical agents. npj Science of Learning. https://doi.org/10.1038/s41539-025-00366-7

q2 · i? · causal · r1

Two-way ANOVA on pre-post learning gains in the same 49-student classroom study. The main effect of prior knowledge was significant, with LPK students demonstrating "greater improvements due to lower baseline scores".

"For learning gains, there was also a significant main effect of prior knowledge, F(1, 45) = 14.98, p < 0.001, with LPK students demonstrating greater improvements due to lower baseline scores (see Table1)."

Discussion¶

Learner Variables¶

• Algebraic Thinking — predictor: learners who differ on it differ in outcomes
• Prior Knowledge — predictor: learners who differ on it differ in outcomes

Related Claims¶

• Agent-condition learning gains trended higher (marginal), with Agent LPK students gaining significantly more than Non-Agent HPK students — related
• Motivational pedagogical agents did not significantly improve posttest scores or error rates in an adaptive algebra system after controlling for pretest — related
• High- and low-prior-knowledge learners differ significantly on an algebra posttest and on intrinsic and germane cognitive load, but not on extraneous load — a broader claim this one bears on
• Propositional knowledge showed a prior knowledge main effect but no instructional method × prior knowledge interaction — related
• Lower-prior-knowledge learners scored higher on an algebra posttest after full-worked than completion-worked examples, while higher-prior-knowledge learners' non-significant advantage ran the other way — related
• HPK students improved significantly only in the Low-Agency condition, with a large post-test advantage over HPK peers in High-Agency (d = .95) — related