World of Words showed no statistically significant effects on the Woodcock-Johnson Picture Vocabulary Subtest or the PPVT-IV¶

Claim · All claims
Evidence · 2 studies · 2 causal r? · q3 · i0 negligible
Currency · newest study 2023 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i0 In the Neuman et al. (2011) study, the Woodcock-Johnson Picture Vocabulary Subtest showed no statistically significant difference (effect size 0.05, p = 0.76). → wj-null q3 i0 In the Neuman et al. (2015) study, the Peabody Picture Vocabulary Test IV showed no statistically significant difference (effect size 0.06, p = 0.66). → ppvt-null

Evidence¶

wj-null¶

What Works Clearinghouse, Institute of Education Sciences, U.S. Department of Education. (2023, August). World of Words. https://whatworks.ed.gov

q3 · i0 · causal · r?

Cluster randomized trial of 331 children across 12 Head Start preschool sites, assessed at the end of 24 weeks on the Woodcock-Johnson Picture Vocabulary Subtest (Forms A and B); the WWC determined the finding not statistically significant, with printed effect size 0.05 (below d = 0.2) and means "99.10 (13.81)" versus "98.40 (12.46)".

"End of 24 weeks of implementation 331 children 12 preschool sites in the United States 99.10 (13.81) 98.40 (12.46) 0.05 +2 No (p = 0.76)"

ppvt-null¶

What Works Clearinghouse, Institute of Education Sciences, U.S. Department of Education. (2023, August). World of Words. https://whatworks.ed.gov

q3 · i0 · causal · r?

Cluster randomized trial of 143 children across 5 state-funded preschool sites in an urban fringe area, assessed at the end of 12 weeks on the PPVT-IV; the finding was not statistically significant, with printed effect size 0.06 (below d = 0.2) and means "101.47 (14.18)" versus "99.96 (13.33)".

"End of 12 weeks of implementation 143 children 5 preschool sites in the United States 101.47 (14.18) 99.96 (13.33) 0.06 +3 No (p = 0.66)"

Discussion¶

Learner Variables¶

• Vocabulary — outcome: instruction changes it

Related Claims¶

• World of Words produced a statistically significant medium effect on a comprehension composite measure (effect size 0.54) after 12 weeks — related
• World of Words produced a statistically significant medium effect on expressive vocabulary (Expressive One-Word Picture Vocabulary Test, 4th Edition; effect size 0.43) in a scaled-up 12-site study — related
• World of Words produced a statistically significant medium-to-large effect on a researcher-developed vocabulary inductive reasoning test (effect size 0.66) — related
• World of Words produced a large, statistically significant effect on taught-word sorting performance (effect size 0.94) in a two-site Head Start study — related