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[IR] The table summarizes information in serveral categories

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[IR] The table summarizes information in serveral categories [#permalink] New post 03 Jul 2012, 10:42
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Hi guys,

I don't understand the reasoning by the answer to question 2 is true.

Especially while the age goes from 29,9 to 28.4 even though the number of lanes is smaller.

Isn't this ONE case a positive correlation?

Can somebody please help.

BTW: Source is GMATPrev Software v2.1
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Re: [IR] The table summarizes information in serveral categories [#permalink] New post 03 Jul 2012, 20:08
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hi there, first sort the average customer age field. You will notice the trend that as age increases, the number of self check unlimited lanes decreases. Like any set of real world data, don't expect it to be perfect. One or two outlier points can be expected. However, do look at the overall/big picture. For the most part, the number of self check unlimited lanes decreases with increasing age. Also the difference in age from 28.4 to 29.4 is small so the two dots on a scatter plot would be relatively close together without skewing the overall trend.
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Kudos [?]: 22 [0], given: 28

Re: [IR] The table summarizes information in serveral categories [#permalink] New post 03 Jul 2012, 22:42
macjas wrote:
hi there, first sort the average customer age field. You will notice the trend that as age increases, the number of self check unlimited lanes decreases. Like any set of real world data, don't expect it to be perfect. One or two outlier points can be expected. However, do look at the overall/big picture. For the most part, the number of self check unlimited lanes decreases with increasing age. Also the difference in age from 28.4 to 29.4 is small so the two dots on a scatter plot would be relatively close together without skewing the overall trend.


Thanks macjas.

So as long as I have only ONE or TWO differences its ok. I will remember that.
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Re: [IR] The table summarizes information in serveral categories [#permalink] New post 16 Jul 2013, 18:53
Could someone please explain how to decide on True/False for the third statement of the question?

Thanks.
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Re: [IR] The table summarizes information in serveral categories [#permalink] New post 14 Sep 2013, 23:02
As for the third statement, sort the table by Self-check express lanes. Look above the average and below the average. There are three stores (I, H, C) below the average. All of them do have restaurants. On the other hand, there are six stores (A, B, D, F, G, E) above the average. Most of them do not have restaurants. It is stated that stores with fewer lanes are less likely to have restaurants than stores with more lanes. But it's quite on the contrary. So, the statement is false.
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Re: [IR] The table summarizes information in serveral categories [#permalink] New post 31 Mar 2014, 10:11
macjas wrote:
hi there, first sort the average customer age field. You will notice the trend that as age increases, the number of self check unlimited lanes decreases. Like any set of real world data, don't expect it to be perfect. One or two outlier points can be expected. However, do look at the overall/big picture. For the most part, the number of self check unlimited lanes decreases with increasing age. Also the difference in age from 28.4 to 29.4 is small so the two dots on a scatter plot would be relatively close together without skewing the overall trend.


So because it's a "negative correlation" we can make the assumption that is an "overall negative correlation?" Is correlation the key here in making assumptions like this on IR?

Thanks!
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Re: [IR] The table summarizes information in serveral categories   [#permalink] 31 Mar 2014, 10:11
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