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Another correlation question on graph - is there any rule for it?

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Manager
Joined: 12 Nov 2016
Posts: 135
Concentration: Entrepreneurship, Finance
GMAT 1: 620 Q36 V39
GMAT 2: 650 Q47 V33
Another correlation question on graph - is there any rule for it?  [#permalink]

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15 Nov 2017, 02:49
During a four-day period, a height measurement and a weight measurement were recorded shortly after delivery for each baby born in a particular hospital. The 19 babies in the study were divided into two groups, Group A and Group B. The chart shows the length, in centimeters (cm), and weight, in kilograms (kg), for each of the 19 babies.

Based on the given information, use the drop-down menus to most accurately complete the following statements.

The correlation between length and weight for the babies in the study is
negligible
strongly positive .
strongly negative

Is there a rule to decide on correlation? What I see here is that two babies with height 47 weigh differently and again at weight 48 and 4 babies with different weights at height 51 where two are much heavier, does not it contradict strong correlation?
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Manager
Joined: 12 Nov 2016
Posts: 135
Concentration: Entrepreneurship, Finance
GMAT 1: 620 Q36 V39
GMAT 2: 650 Q47 V33
Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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16 Nov 2017, 04:57
It is probably due to structure of GMAT that IR does not count towards total score that there is little interest in IR questions... probably a growing trend for EA acceptance by leading business will change that

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Manager
Joined: 17 May 2015
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Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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16 Nov 2017, 05:50
1
Erjan_S wrote:
During a four-day period, a height measurement and a weight measurement were recorded shortly after delivery for each baby born in a particular hospital. The 19 babies in the study were divided into two groups, Group A and Group B. The chart shows the length, in centimeters (cm), and weight, in kilograms (kg), for each of the 19 babies.

Based on the given information, use the drop-down menus to most accurately complete the following statements.

The correlation between length and weight for the babies in the study is
negligible
strongly positive .
strongly negative

Is there a rule to decide on correlation? What I see here is that two babies with height 47 weigh differently and again at weight 48 and 4 babies with different weights at height 51 where two are much heavier, does not it contradict strong correlation?

HiErjan_S,

To find the correlation, observe the overall trend rather than individual values. You have to oberve the overall direction of the given values. In the given example its clear that height and weight are strongly positively correlated.
http://www.statisticshowto.com/directio ... sociation/

Hope it helps.
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Joined: 05 Jul 2017
Posts: 512
Location: India
GMAT 1: 700 Q49 V36
GPA: 4
Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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13 Jun 2018, 05:06
So the answer to this question is "Strongly positive"?
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Posts: 11
Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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27 Dec 2018, 11:47
1
ganand wrote:
Erjan_S wrote:
During a four-day period, a height measurement and a weight measurement were recorded shortly after delivery for each baby born in a particular hospital. The 19 babies in the study were divided into two groups, Group A and Group B. The chart shows the length, in centimeters (cm), and weight, in kilograms (kg), for each of the 19 babies.

Based on the given information, use the drop-down menus to most accurately complete the following statements.

The correlation between length and weight for the babies in the study is
negligible
strongly positive .
strongly negative

Is there a rule to decide on correlation? What I see here is that two babies with height 47 weigh differently and again at weight 48 and 4 babies with different weights at height 51 where two are much heavier, does not it contradict strong correlation?

HiErjan_S,

To find the correlation, observe the overall trend rather than individual values. You have to oberve the overall direction of the given values. In the given example its clear that height and weight are strongly positively correlated.
http://www.statisticshowto.com/directio ... sociation/

Hope it helps.

Reviving this old thread....my issue with this question is that it's not really that strong. There's a few outliers that any academic would then question the entire dataset and need more data to make a real 'strong' conclusion (the question choices are 'Strong correlation' or none).

So, is the goal of any GMAT IR question to spot correlation to just think like someone who is just barely looking at data, or as a data scientist would? Just trying to figure these kinds of questions out,
Intern
Joined: 01 Jan 2019
Posts: 39
Concentration: Finance, Economics
GPA: 3.24
Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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09 Jan 2019, 11:42
Can someone explain the correlation?
Manager
Joined: 05 Dec 2016
Posts: 241
Concentration: Strategy, Finance
GMAT 1: 620 Q46 V29
Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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14 Mar 2019, 01:04
The correlation is strongly positive. Potentially such type of problems would be easier to solve for those who are familiar with statistics, specifically regression models. If you try to formulate a linear equation basing on the figures above you would find that the trend is upward sloping showing general strong positive correlation.
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Joined: 04 Mar 2019
Posts: 5
Re: Another correlation question on graph - is there any rule for it?  [#permalink]

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14 Mar 2019, 01:20
Re: Another correlation question on graph - is there any rule for it?   [#permalink] 14 Mar 2019, 01:20
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Another correlation question on graph - is there any rule for it?

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