mandyO1
22.04.2020 •
Mathematics
A researcher would like to compare the effectiveness of two different methods for teaching third-grade mathematics. One group of students is assigned to Dr. Tang's class using method I and another group is assigned to Dr. Washington's class using method II. At the end of the school year, each child is given a standardized mathematics achievement test and the two groups of scores are compared. What variable is confounded with the key variable of interest?
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Since Helen Keller does not speak, the stage directions communicate her physical movements and her reactions to other people and the world.
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