Select True/False question : Integrated Reasoning (IR)
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Select True/False question

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Select True/False question [#permalink]

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05 Sep 2013, 10:24
For each of the following statements, select True if the statement can be verified as true based on the information in the table. Otherwise, select False.

Question is: There is a positive correlation between the number of public museums and the number of visitors per year.

My answer is
[Reveal] Spoiler:
false
but OA is
[Reveal] Spoiler:
True.

My reasoning for this question: Thrice in the graph the “number of visitors per year” drop while the number of public museum increases. I have marked it above. So, can you please help me in understanding how it is a positive correlation ? Am I missing something ?

Thanks & Regards
Vinni
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IR - European Museums.JPG [ 38.04 KiB | Viewed 1486 times ]

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Re: Select True/False question [#permalink]

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09 Sep 2013, 00:20
answer should be false.

No correlation between the public museums and no of visitors per year.
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09 Sep 2013, 02:11
Hi,

i think that the answer is TRUE.

these are the entries:

163 - 2,0
203 - 11,5 (X)
220 - 2,4
615 - 10,1
713 - 19,6
960 - 12,6 (X)
973 - 56,0
1053 - 40,4 (X)

Except for 3 entries when the "public" goes up, "the number of visitor" goes up; that's why correlation is POSITIVE. Please notice that the quetion did not ask if the correlation was equal to "1" (for example). So you can accept also few values that are not similar to the trend.
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02 Jan 2014, 02:06
that means we can still have correlation with some exception?

we are not taught of what is correlation.

we learn from this question.
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Re: Select True/False question [#permalink]

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12 Jan 2014, 00:02
I dont think we can say that the correlation is positive when there are a few entries missing the trend. Can experts please help and clarify if the answer can actually be true basis thr reasoning presented above?
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27 Feb 2014, 09:38
can a gmat expert clarify?thanks.
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07 May 2014, 15:29
If you plot the points on a graph, you will get a scatter plot. Taking the line of best fit and you will see that this line has a positive gradient hence a positive correlation.
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Re: Select True/False question [#permalink]

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23 May 2014, 03:42
A perfect positive correlation means that 100% of the time, the relationship that appears to exist between two variables is positive.
It is also possible for two variables to be positively correlated in some, but not all, cases.

This is what you get when you plot a scatter plot.

Rgds,
Rajat
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Post 30_ScatterPlot.png [ 13.34 KiB | Viewed 814 times ]

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Re: Select True/False question   [#permalink] 23 May 2014, 03:42
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