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Re: The table summarizes information in several categories about the 9 [#permalink]
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Official Explanation

The last row in the "Self-check express lanes" column indicates that the average number of self-check express lanes per store is 6.89. The only two stores with average customer ages between 34 and 36 are Store A and Store F, each of which has 8 self-check express lanes—more than the average number, 6.89. So in each store with an average customer age between 34 and 36, the number of self-check express lanes is above average.

The correct answer is True.

Sorting the table by the "Average customer age" column, we see that stores with higher average customer ages generally tend to have fewer self-check unlimited lanes. Thus, the table shows a negative correlation between average customer age and the number of self-check unlimited lanes.

The correct answer is True.

Sorting the table by the "Self-check express lanes" column, we see that all three stores with less than the average number of self-check express lanes have restaurants, whereas only one store of the six with more than the average number of self-check express lanes has a restaurant. Thus, stores with fewer self-check express lanes than average are more likely to have restaurants than are stores with more self-check express lanes than average, not less likely.

The correct answer is False.
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Re: The table summarizes information in several categories about the 9 [#permalink]
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1) In store A -average customer age = 34.5 ->SCEL-8(>6.89-average),Store F also has SCEL 8 ---True
2)True - Since SCUL increases and the Avg customer age decreases
3)False - I is the exception here

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Re: The table summarizes information in several categories about the 9 [#permalink]
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2)True - Since SCUL increases and the Avg customer age decreases


Posted from my mobile device[/quote]


Can someone please explain this. There are exceptions at 6, 8 and one of the fours if we arrange it according to ACA in ascending order.
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Re: The table summarizes information in several categories about the 9 [#permalink]
RoughBook wrote:
2)True - Since SCUL increases and the Avg customer age decreases


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Can someone please explain this. There are exceptions at 6, 8 and one of the fours if we arrange it according to ACA in ascending order.[/quote]

Did we figure this out yet? I'm confused about this one too.
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Re: The table summarizes information in several categories about the 9 [#permalink]
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I agree. There is a negative correlation trend between age and SCUL (nice acronym) but there are exceptions, so I answered "no" as well... I will have to ask for help from someone with more IR experience as to why GMAC would classify this as "True"
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Re: The table summarizes information in several categories about the 9 [#permalink]
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Nicoz wrote:
It would be a negative correlation, so that’s true. In data analysis, one or two points can have different values means they are non-correlated but overall if you plot them and draw a line of correlation it would come out as negatively correlated with the function or factor compared.

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Thanks! Now that you explain it, that makes sense. :cool: but I did not like having a few values that were not fitting in the pattern....
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Re: The table summarizes information in several categories about the 9 [#permalink]
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Yes unfortunately that do happens with me several times when I manage quality aspect in projects.

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Re: The table summarizes information in several categories about the 9 [#permalink]
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SajjadAhmad wrote:
Project IR Butler 2019-20 - Get one IR Question Everyday
Question # 32, Date : 01-Nov-2019
This post is a part of Project IR Butler 2019-20. Click here for Details


The table summarizes information in several categories about the 9 stores in a small grocery chain. The table also includes chain-wide averages where appropriate.
Attachment:
Tab.jpg


For each of the following statements, select True if the statement can be verified to be true based on the information provided. Otherwise, select False.

TrueFalseStatements
In each store whose average customer age falls between 34 and 36, the number of self-check express lanes is above average.
There is a negative correlation between the number of self-check unlimited lanes and the average customer age.
Stores in this table that have fewer self-check express lanes than the chain-wide average are less likely to have restaurants than stores that have more self-check express lanes than the chain-wide average.

Attachment:
OA.jpg

For the second question, we have increasing SCUL in the order
[I/G/D=0] [A/C/E=4] [B/F=6] H=8
[56.7/38.8/50.5] [34.5/32/42.5] [28.4/34.6] 29.9

So for SCUL from 0 to 8, either ACA decreases from 56.7 to 29.9 or 50.5 to 29.9 or 38.8 to 29.9.
Hence a negative correlation. TRUE then.
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Re: The table summarizes information in several categories about the 9 [#permalink]
Nicoz wrote:
It would be a negative correlation, so that’s true. In data analysis, one or two points can have different values means they are non-correlated but overall if you plot them and draw a line of correlation it would come out as negatively correlated with the function or factor compared.

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I too was thinking so but surprisingly this isnt logic behind second question .
I used filter for this specific second question(use SCUL filter if you are viewing this question in mba.com mock1 ) and found that the data
shows complete negative correlation .
check stores in this order - DGI averages ACEBFH . The SCUL data points respectively will show 0,0,0,3.56,4,4,4,6,6,8
with avg customer age 50.50, 38.80,56.70,......29.90 . Its clearly showing negative correlation .
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Re: The table summarizes information in several categories about the 9 [#permalink]
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Hi

Can someone please explain why 3rd sentence is marked as "false"?
There is indeed one exception, but the statement says "Stores in this table that have fewer self-check express lanes than the chain-wide average are less likely to have restaurants than stores that have more self-check express lanes than the chain-wide average."
"LESS LIKELY" doesn't mean it always have to happen.
Therefore, there IS such negative correlation, with just one exception.
Please let me know what you think about it.
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Re: The table summarizes information in several categories about the 9 [#permalink]
Hi
With reference to the 2nd question - Does this imply that it’s ok to drop outlier data points in such questions?

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Re: The table summarizes information in several categories about the 9 [#permalink]
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bb wrote:
I agree. There is a negative correlation trend between age and SCUL (nice acronym) but there are exceptions, so I answered "no" as well... I will have to ask for help from someone with more IR experience as to why GMAC would classify this as "True"



I might be wrong in this approach, but if we take average of (average age values) for same no. of SCUL, it would certainly show a negative correlation.

SUCL - Avg(Avg Age)
0 - 48.5
4 - 36.33
6 - 31.5
8 - 29.9

This shows a negative correlation.

PS: I too marked it as a "False" in GMAT Prep.
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Re: The table summarizes information in several categories about the 9 [#permalink]
Nicoz wrote:
It would be a negative correlation, so that’s true. In data analysis, one or two points can have different values means they are non-correlated but overall if you plot them and draw a line of correlation it would come out as negatively correlated with the function or factor compared.

Posted from my mobile device


Thanks. Just read up on the 'line of best fit' which I think is what the question is focused on.
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Re: The table summarizes information in several categories about the 9 [#permalink]
What does exactly mean the term "chain-wide" in this question?
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Re: The table summarizes information in several categories about the 9 [#permalink]
I thought this was a trick question.
For each of the following statements, select True if the statement can be verified to be true based on the information provided. Otherwise, select False.

All questions can be verified to be true or not based on the information provided, thus, I thought all of them could be answered as True.
Can someone Nicoz bb Sajjad1994 or anyone else please confirm why this is incorrect. Sometimes there are trick questions where you have words like 'each' that affect the reasoning, I'm not sure why this is not the case.
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Re: The table summarizes information in several categories about the 9 [#permalink]
AndreMarchan wrote:
What does exactly mean the term "chain-wide" in this question?


Dear AndreMarchan
why do you need the meaning of the term if you have the hint in the prompt and the particular value in the table?
Quote:
The table also includes chain-wide averages where appropriate.
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Re: The table summarizes information in several categories about the 9 [#permalink]
Note to self: READ THE QUESTION, then WRITE IT DOWN before SOLVING
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Re: The table summarizes information in several categories about the 9 [#permalink]
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