The TLRI project was a two-year collaboration among two statisticians, two researchers, and nine teachers. There was an urgent need to understand how students can progressively develop informal statistical inferential reasoning from Levels 5 to 8 of the new curriculum. The project team designed innovative approaches to develop students’ informal inferential reasoning and sought evidence that these innovations had a significant effect on improving students’ statistical reasoning in this domain.

A set of guidelines were developed to support making the call at years 10, 11 and 12 for comparison investigations.

support developing underlying concepts for making the call.

This work is supported in part by a grant from.

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