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A study of students taking Statistics 101 was done. Four hundred students who studied for more than 10 hours averaged a B. Two hundred students who studied for less than 10 hours averaged a C. This difference was significant at the 0.01 level. What does this mean?
10 years ago

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MM
There is less than a 0.01 chance that the first group’s grades were better by chance alone.
7 years ago

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