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A teacher has two versions of an exam, and randomly distributes them to his students. Of...

A teacher has two versions of an exam, and randomly distributes them to his students. Of the 21 students taking Version A, the mean score was 82 out of 100, with standard deviation 12 points. Of the 22 students taking Version B, the mean score was 77 out of 100, with standard deviation 9 points. Is there evidence at the 5% level of significance that average score for the two versions is not the same?
  

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