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The graph shows the results of an investigation to determine the relat

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Sajjad1994
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The graph shows the results of an investigation to determine the relat [#permalink] New post   16 Nov 2023, 10:54
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Data Insights (DI) Butler 2023-24 [Question #117, Date: Nov-16-2023] [Click here for Details]


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The graph shows the results of an investigation to determine the relationship (if any) between leaf area and exposure to light for two species of plant. The plants were grown under identical conditions apart from the light intensity to which they were exposed. The points on the graph represent the average leaf areas for twenty full-grown leaves at each level of light exposure.

A scientist could best conclude that for Species A there is correlation between leaf area and light intensity.

The light intensity that apparently results in the greatest difference in leaf areas between the two species is units.
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Dropdown 1: Positive Dropdown 2: 2.5
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muskanrajyan5
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Re: The graph shows the results of an investigation to determine the relat [#permalink] New post   16 Nov 2023, 22:44
1. no
2. 2.5

Is this the correct answer? Sajjad1994
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Sajjad1994
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Re: The graph shows the results of an investigation to determine the relat [#permalink] New post   16 Nov 2023, 22:52
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muskanrajyan5 wrote:
1. no
2. 2.5

Is this the correct answer? Sajjad1994


No! give it another shot.
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The graph shows the results of an investigation to determine the relat [#permalink] New post   18 Nov 2023, 00:08
Hi Sajjad1994
Can you please explain why answer to question 1 is Positive?
My reason - For species A I can see that First when Light intensity increases, Leaf area increase but In between I can also see that when Light intensity increases, Leaf area decreases. Therefore, there is no correlation.
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Re: The graph shows the results of an investigation to determine the relat [#permalink] New post   19 Nov 2023, 07:39
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Drawing curves that best fit the data show that for species A there is a clear trend towards greater light intensity producing greater leaf area hence we have a positive correlation between the two parameters.

The difference between the two cures is greatest at 2.5 units of light intensity. If we extrapolate the curves it looks as though there would be an even bigger difference at 6 units, but we cannot be sure where the cures will go at levels above 5 as no data is provided. It is possible, for example, that curve A will plateau at 5.

Answer: Positive and 2.5
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The graph shows the results of an investigation to determine the relat [#permalink] New post   20 Nov 2023, 00:34
Nikita45 wrote:
Can you please explain why answer to question 1 is Positive?
My reason - For species A I can see that First when Light intensity increases, Leaf area increase but In between I can also see that when Light intensity increases, Leaf area decreases. Therefore, there is no correlation.


To check the correlation, we can choose the points, which are in the Majority (Those that behave in a similar fashion). In the case of A, there are only a few points that don't show the correlation. IMO, we can safely call them outliers and ignore them to draw the best-fit curve.

Watch the video below on How to draw a line of best fit-

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The graph shows the results of an investigation to determine the relat [#permalink]
20 Nov 2023, 00:34
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