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positive co-relation ? how to see it from the table

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by Jim@StratusPrep » Tue Oct 09, 2012 10:06 am
Generally speaking when one goes up so does the other... You will often have outlier data points, but the correlation is still positive; the correlation is just not as strong as it could be.
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by vikram4689 » Tue Oct 09, 2012 5:38 pm
Jim@StratusPrep wrote:Generally speaking when one goes up so does the other... You will often have outlier data points, but the correlation is still positive; the correlation is just not as strong as it could be.
i still can't understand how did you conclude "when one goes up so does the other". compare following rows. all of the following cases reveal opposite trend. i want to learn how to solve this type of question.

2-3
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