GRE Prep 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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
The frequency distributions shown above represent two groups
[#permalink]
16 Dec 2015, 12:13
16 Dec 2015, 12:13
1
Expert Reply
00:00
Question Stats:
94% (00:22) correct
5% (00:00) wrong based on 18 sessions
Hide Show timer Statistics
The frequency distributions shown above represent two groups of data. Each of the data values is a multiple of 10.
Quantity A |
Quantity B |
The standard deviation of distribution A |
The standard deviation of distribution B |
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
Re: GRE Data Analysis: The frequency distributions shown
[#permalink]
16 Dec 2015, 12:14
16 Dec 2015, 12:14
1
Expert Reply
Show: :: Solution
Distributions A and B have the same spread (with different skew) and thus the same standard deviation. So the two quantities are equal.
Think of distributions A and B as equal but opposite changes to the symmetrical distribution N. Distribution A boosts the frequency of the lowest and next to lowest values in N, whereas distribution B boosts the frequency of the highest and next to highest values in N. As a result, distributions A and B pull the average of N in opposite directions but make equal adjustments to its standard deviation.
Think of distributions A and B as equal but opposite changes to the symmetrical distribution N. Distribution A boosts the frequency of the lowest and next to lowest values in N, whereas distribution B boosts the frequency of the highest and next to highest values in N. As a result, distributions A and B pull the average of N in opposite directions but make equal adjustments to its standard deviation.
Re: GRE Data Analysis: The frequency distributions shown
[#permalink]
01 Feb 2020, 10:28
01 Feb 2020, 10:28
RBornPowerScore wrote:
Show: :: Solution
Distributions A and B have the same spread (with different skew) and thus the same standard deviation. So the two quantities are equal.
Think of distributions A and B as equal but opposite changes to the symmetrical distribution N. Distribution A boosts the frequency of the lowest and next to lowest values in N, whereas distribution B boosts the frequency of the highest and next to highest values in N. As a result, distributions A and B pull the average of N in opposite directions but make equal adjustments to its standard deviation.
Think of distributions A and B as equal but opposite changes to the symmetrical distribution N. Distribution A boosts the frequency of the lowest and next to lowest values in N, whereas distribution B boosts the frequency of the highest and next to highest values in N. As a result, distributions A and B pull the average of N in opposite directions but make equal adjustments to its standard deviation.
Can you pls explain with a different approach... not able to understand this solution ??
