Two samples of 8 high school seniors each has been matched on IQ before beginning an experiment in learning words in a fictitious anguage. They were then allowed 20 minutes of study the meaning of the words, after which they were tested for the number of words learned. Group A studied in pairs, one student reading the words to other, the students Group B studied alone. The following table shows the results: Group A Group B 20 25 13 15 15 20 10 15 18 16 10 11 20 15 12 20

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