Based on the Strand model, fractions

A) Should be introduced using manipulatives rather than writtensymbols.
B) Cannot be understood until children have the concept ofreversibility

C) Are related to understanding of reversibility
D) All of the above are true


A

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Indicate whether this statement is true or false.

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A researcher conducted a study examining the extent to which graduate students' grades in an introductory research class can be predicted from their GRE test scores and their undergraduate GPA. Her sample consisted of 10 students from a class who volunteered for the study. Which of the following is one cause for concern about this study?

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