Mean clause length showed a small negative difference favoring the comparison group, not statistically significant¶

Claim · All claims
Evidence · 1 study · causal r? · q3 · i0 negligible
Currency · newest study 2006 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i0 On the mean clause length outcome, the Arthur group's change-score mean difference was –0.22 (effect size –0.11, ns), numerically favoring the comparison group. → Arthur (WWC Intervention Report) 2006

Evidence¶

Arthur (WWC Intervention Report) 2006¶

Arthur (WWC Intervention Report). (2006). What Works Clearinghouse, U.S. Department of Education. http://pbskids.org/arthur/index.html

q3 · i0 · causal · r?

In the WWC summary of study findings from the randomized controlled trial (n = 102 analyzed), the mean clause length row shows Arthur group mean 0.54 (SD 1.67) versus comparison 0.76 (SD 2.08), a mean difference of –0.22, effect size –0.11, ns, improvement index –5. Clause length served as a proxy for narrative complexity.

"Mean clause length K 102 0.54 (1.67) 0.76 (2.08) –0.22 – 0.11 ns –5"

Discussion¶

Learner Variables¶

• Oral Language — outcome: instruction changes it

Related Claims¶

• The average improvement index for Arthur in English language development is +11 percentile points, ranging from –5 to +17 across findings — related
• Watching Arthur improves English narrative skill development in kindergarten English language learners more than an alternative educational program (potentially positive effects) — related
• The supporting evidence is a randomized controlled trial in which 108 kindergarten English learners watched 54 episodes of Arthur or Between the Lions over one school year — related