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

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vikram4689: Legendary Member; Posts: 1325; Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members; Thanked: 105 times

by vikram4689 » Tue Oct 09, 2012 8:57 am

with the increase in public museums, no. of visitors sometimes increase and sometimes decrease. how can i conclude that both of them are POSITIVELY co-related

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Source: Beat The GMAT — Quantitative Reasoning | Tue Oct 09, 2012 8:57 am

Jim@StratusPrep: MBA Admissions Consultant; Posts: 2279; Joined: Fri Nov 11, 2011 7:51 amFollowed by: 266 members; Location: New York; Thanked: 660 times; GMAT Score:770

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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vikram4689: Legendary Member; Posts: 1325; Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members; Thanked: 105 times

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
2-4
5-6
7-8

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