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The table provides information from a statistical analysis of data on

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GMAT Date: 03-14-2015
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The table provides information from a statistical analysis of data on [#permalink]

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New post 08 Mar 2015, 11:06
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can't understand the 3rd question

[Reveal] Spoiler:
    1)false
    2)true
    3)false



OE
[Reveal] Spoiler:
    1)In this column, the median (0.1) is equal to the mode, so it is not larger. The correct answer is False.

    2)Since the figure for the armed forces has a margin of error of 0.9, as many as 75.3% of workers may have driven alone to work in the armed forces, a percentage that is larger than the 75.1% given for construction workers (and, naturally, larger than the 74.8% minimum for construction workers). The correct answer is True.

    3)The "Drove alone" column accounts for the largest percentage of commuters in all industries, so it would have the largest impact on any industry's overall margin of error. The margin of error column for commuters who drove alone shows that "Armed forces" (0.9) is the only industry whose overall margin of error would likely be greater than that of "Agriculture, forestry, and mining" (0.7). From there, comparing these two industries across all modes of transportation shows that the margins of error for "Armed Forces" are either higher than or tied with those for "Agriculture, forestry, and mining" in every case, so this initial relationship continues to hold. It's important to note that the phrase "relative to its own total commuters" means that we are concerned only with the percentages that would form a weighted average, not with the margin of error expressed as a raw number of commuters. This statement is False.
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Re: The table provides information from a statistical analysis of data on [#permalink]

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New post 08 Mar 2015, 17:30
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hi vinay,
the third question talks of two things..
1) overall error of margin... it will be equal to the sum of (all margin error *respective percentage*total strength)
2) relative to its own total customer base... it means we are interested in only the percentage and not number..
combine the two ..... now it means the sum of (all margin error *respective percentage)....
if we look at the armed forces right below it(also provided in OE), you can see it has higher margin of error and higher % in each category so atleast armed forces has 'the overal margin.......customer base' more than agriculture ,so false...
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Re: The table provides information from a statistical analysis of data on [#permalink]

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New post 11 Mar 2015, 05:24
chetan2u wrote:
hi vinay,
the third question talks of two things..
1) overall error of margin... it will be equal to the sum of (all margin error *respective percentage*total strength)
2) relative to its own total customer base... it means we are interested in only the percentage and not number..
combine the two ..... now it means the sum of (all margin error *respective percentage)....
if we look at the armed forces right below it(also provided in OE), you can see it has higher margin of error and higher % in each category so atleast armed forces has 'the overal margin.......customer base' more than agriculture ,so false...



Hi chetan2u,
Thanks for the explanation.It's crystal clear now.

Vinyas. :)
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Re: The table provides information from a statistical analysis of data on [#permalink]

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New post 20 Sep 2016, 04:51
Hi chetan2u,

can you please explain second question.
i marked as false.
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Re: The table provides information from a statistical analysis of data on [#permalink]

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New post 28 Feb 2017, 02:22
I'm a little confused about the second part of the question. Do we take the percentage of the total comutters and then calculate the margin of error. I'm doing something wrong and getting the answer as false.
Re: The table provides information from a statistical analysis of data on   [#permalink] 28 Feb 2017, 02:22
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