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Fife, James H.; James, Kofi; Peters, Stephanie – ETS Research Report Series, 2020
The concept of variability is central to statistics. In this research report, we review mathematics education research on variability and, based on that review and on feedback from an expert panel, propose a learning progression (LP) for variability. The structure of the proposed LP consists of 5 levels of sophistication in understanding…
Descriptors: Mathematics Education, Statistics Education, Feedback (Response), Research Reports
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Dai, David Wei; Roever, Carsten – Language Assessment Quarterly, 2019
Because English is widely used as a lingua franca, language testers have started to consider the introduction of non-native accents into English listening tests. This study investigates how accents influence test-takers' performance, and also elicits test-takers' subjective perception of accents. Eighty adolescent L1-Mandarin test takers were…
Descriptors: Language Variation, English (Second Language), Native Language, Mandarin Chinese