Last visit was: 29 Apr 2026, 22:23 It is currently 29 Apr 2026, 22:23
Home
Messages
Tests
Schools
Events
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
Sub 505 (Easy)|   Graphs|      
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 29 Apr 2026
Posts: 16,761
Own Kudos:
51,977
 [4]
Given Kudos: 6,340
GPA: 3.62
Products:
GMAT Club Tests Forum Quiz
Posts: 16,761
Kudos: 51,977
 [4]
The graph shows the results of an investigation to determine the relat 16 Nov 2023, 10:54
1
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide Answer
Hide
Show
History
Dropdown 1: Positive Dropdown 2: 2.5
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

91% (01:30) correct 9% (02:06) wrong based on 357 sessions

History

Date
Time
Result
Not Attempted Yet
Data Insights (DI) Butler 2023-24 [Question #117, Date: Nov-16-2023] [Click here for Details]

Attachment:
14.jpg
14.jpg [ 31.76 KiB | Viewed 6614 times ]

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.
Submit Answer
Start the Timer above, select the dropdowns, and click "Submit" to add this question to your Error log.
ShowHide Answer
Official Answer
Dropdown 1: Positive Dropdown 2: 2.5
User avatar
muskanrajyan5
User avatar
Joined: 23 Aug 2023
Last visit: 21 Nov 2023
Posts: 24
Own Kudos:
13
Given Kudos: 78
Location: India
Posts: 24
Kudos: 13
The graph shows the results of an investigation to determine the relat 16 Nov 2023, 22:44
Kudos
Add Kudos
Bookmarks
Bookmark this Post
1. no
2. 2.5

Is this the correct answer? Sajjad1994
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 29 Apr 2026
Posts: 16,761
Own Kudos:
51,977
Given Kudos: 6,340
GPA: 3.62
Products:
GMAT Club Tests Forum Quiz
Posts: 16,761
Kudos: 51,977
The graph shows the results of an investigation to determine the relat 16 Nov 2023, 22:52
Kudos
Add Kudos
Bookmarks
Bookmark this Post
muskanrajyan5
1. no
2. 2.5

Is this the correct answer? Sajjad1994
Show more

No! give it another shot.
User avatar
Nikita45
User avatar
Joined: 31 May 2021
Last visit: 11 Jan 2024
Posts: 15
Own Kudos:
11
Given Kudos: 4
Schools: Fisher '26 (S)
Schools: Fisher '26 (S)
Posts: 15
Kudos: 11
The graph shows the results of an investigation to determine the relat 18 Nov 2023, 00:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
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.
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 29 Apr 2026
Posts: 16,761
Own Kudos:
51,977
Given Kudos: 6,340
GPA: 3.62
Products:
GMAT Club Tests Forum Quiz
Posts: 16,761
Kudos: 51,977
The graph shows the results of an investigation to determine the relat 19 Nov 2023, 07:39
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Official Explanation

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
User avatar
BottomJee
User avatar
Retired Moderator
Joined: 05 May 2019
Last visit: 09 Jun 2025
Posts: 994
Own Kudos:
1,463
Given Kudos: 1,009
Affiliations: GMAT Club
Location: India
GMAT Focus 1: 645 Q82 V81 DI82
GMAT 1: 430 Q31 V19
GMAT 2: 570 Q44 V25
GMAT 3: 660 Q48 V33
GPA: 3.26
WE:Engineering (Manufacturing)
Products:
My Reviews
GMAT Focus 1: 645 Q82 V81 DI82
GMAT 3: 660 Q48 V33
Posts: 994
Kudos: 1,463
The graph shows the results of an investigation to determine the relat 20 Nov 2023, 00:34
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Nikita45
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.
Show more

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-

Moderators:
Bunuel
Math Expert
109994 posts
kingbucky
498 posts
Gmat860sanskar
212 posts