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You are interested in the difference in mathematics scores between high school students who are taught by two different teachers. The sample statistics are following:

You are interested in the difference in mathematics scores between high school students who are taught by two different teachers.

The sample statistics are following:

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Sample 1: N, = 20, X1 = 70, $2 = 42 Sample 2: N2 = 10, X2 = 50, $2 2 = 2 2

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