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CR doubt

by gauravgundal » Sat Mar 20, 2010 11:39 pm
The proportion of females among high school soccer players has dramatically increased over the past 15 years. This is seen in surveys completed by graduating seniors. In 1985, less than 10% of senior girls surveyed had played soccer in high school. In 2000, more than 25% of girls surveyed had participated in soccer. To evaluate the argument above, which of the following pieces of additional information would be most helpful?

A.The percentage of male high school soccer players for the class of 1985 and 2000.
B.The percentage of girls who played soccer after high school.
C.The percentage of girls that graduated from high school in 1985.
D.The percentage of girls that did not graduate but did play soccer in high school for the class of 2000.
E.The percentage of boys that graduated from high school in 1985 and 2000


Please explain the answer with proper reasons

My doubt :
why answer choice D cannot be the answer.
even if conclusion says that 'proportion of females' increased ,the evidence talks about percentage of senior girls.
so my question is-- how '% of senior girls' increase can affect a proportion of females.
1. Proportion of female for the given condition can be calculated only if the % male ( high school soccer players for the c lass of 1985 and 2000)is known.

2. But,answer choice D can be neglected because even this can undermine the conclusion

suppose
% M -Unknown
in 1985 , total senior girls = 100
10 % = 10
In 2000 , total senior girls = 100
25% = 25 , 10 + answer choice D
even if I increased the total senior girls from 100 to 1000(In 2000)
, 25% = 250 , 10 (In 1985) + 140(10% senior didn
t graduate from 85 to 2000) + 100 (freshers playing soccer)




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by h_jitendras » Sun Mar 21, 2010 12:01 am
gauravgundal wrote:The proportion of females among high school soccer players has dramatically increased over the past 15 years. This is seen in surveys completed by graduating seniors. In 1985, less than 10% of senior girls surveyed had played soccer in high school. In 2000, more than 25% of girls surveyed had participated in soccer. To evaluate the argument above, which of the following pieces of additional information would be most helpful?

A.The percentage of male high school soccer players for the class of 1985 and 2000.
B.The percentage of girls who played soccer after high school.
C.The percentage of girls that graduated from high school in 1985.
D.The percentage of girls that did not graduate but did play soccer in high school for the class of 2000.
E.The percentage of boys that graduated from high school in 1985 and 2000


Please explain the answer with proper reasons

My doubt :
why answer choice D cannot be the answer.
even if conclusion says that 'proportion of females' increased ,the evidence talks about percentage of senior girls.
so my question is-- how '% of senior girls' increase can affect a proportion of females.
1. Proportion of female for the given condition can be calculated only if the % male ( high school soccer players for the c lass of 1985 and 2000)is known.

2. But,answer choice D can be neglected because even this can undermine the conclusion

suppose
% M -Unknown
in 1985 , total senior girls = 100
10 % = 10
In 2000 , total senior girls = 100
25% = 25 , 10 + answer choice D
even if I increased the total senior girls from 100 to 1000(In 2000)
, 25% = 250 , 10 (In 1985) + 140(10% senior didn
t graduate from 85 to 2000) + 100 (freshers playing soccer)




Experts your comments:
What is the OA?
I think A should be the answer
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by gmatmachoman » Sun Mar 21, 2010 12:25 am
saying we neeed to know The percentage of boys that graduated from high school in 1985 and 2000 is same as knowing

The percentage of gals that graduated from high school in 1985 and 2000

Total = % Boys+ %Gals

So E

But A gives only % of male who played in soccer and Not the % of total male!
Last edited by gmatmachoman on Sun Mar 21, 2010 12:38 am, edited 3 times in total.
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by kstv » Sun Mar 21, 2010 12:26 am
The question is too maths intensive for CR makes a better DS question.
So logic of DS will do fine.
To find the proportion of females among high school soccer it is absolutely necessary to have some idea of the total who played soccer which A gives. Conclusion is Female/ Male has increased. Vital is to know the Male %.

(D) will give you a more accurate picture.
in 1985 , total senior girls = 10x
10 % = x
In 2000 , total senior girls = 10x+10y
25% = 2.5(x+y) choice D says that 2.5(x+y) is not a correct figure cos' it is omitting high school girls who did not gradute

Between vital and accurate I feel vital wins. IMO A.
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by gmatmachoman » Sun Mar 21, 2010 12:35 am
kstv wrote:The question is too maths intensive for CR makes a better DS question.
So logic of DS will do fine.
To find the proportion of females among high school soccer it is absolutely necessary to have some idea of the total who played soccer which A gives. Conclusion is Female/ Male has increased. Vital is to know the Male %.

(D) will give you a more accurate picture.
in 1985 , total senior girls = 10x
10 % = x
In 2000 , total senior girls = 10x+10y
25% = 2.5(x+y) choice D says that 2.5(x+y) is not a correct figure cos' it is omitting high school girls who did not gradute

Between vital and accurate I feel vital wins. IMO A.
Y not E??
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by lunarpower » Sun Mar 21, 2010 2:09 am
this is a terribly written question, but i can see the intention of the problem writers.

(what's the source of this question? this question features unusually sloppy writing, and so is a black mark on the record of whichever company wrote it.)

the problem STATEMENT, at least, is decently well-written, featuring one clearly articulable problem.
namely, the evidence shows that a higher percentage OF GIRLS played soccer in 2000, but the prompt takes this evidence to mean that these girls constituted a higher percentage OF SOCCER PLAYERS in general.

there's a big gaping problem with this, though: if the percentage OF BOYS playing soccer has increased at the same rate, or even faster, then the girls will constitute no larger a proportion (or even a smaller proportion) of the overall group of soccer players.

so, we need a comparable measure of the proportion OF BOYS who have played soccer in the two years under consideration.

the intended answer is (a), although the writing of that answer choice is so sloppy as to render it meaningless.
specifically, the choice says "the percentage of male high school soccer players", which, strictly speaking, actually doesn't mean anything at all! (i.e., if taken literally, this signifies the percentage OF those male high school soccer players WHO... well, we don't know.)
the proper wording of this answer choice should be more like "the percentage OF male high school graduates WHO played soccer in 1985 and 2000", but it is definitely the intended answer to the problem.
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by lunarpower » Sun Mar 21, 2010 2:12 am
one easier method of elimination, by the way --

the only piece of information given to us in the prompt is given for both 1985 and 2000. therefore, it is clear that whatever the missing information is, it's missing for both 1985 and 2000.

therefore, we can quickly eliminate any choice specifying information for only one of these two years, or for no specific year at all, since such a choice will automatically give an incomplete comparison.

this surprisingly basic observation actually eliminates three of the five choices -- (b), (c), and (d).
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by gmatmachoman » Sun Mar 21, 2010 2:12 am
@Dear Ron,

Why Not E??
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by lunarpower » Sun Mar 21, 2010 2:30 am
gmatmachoman wrote:@Dear Ron,

Why Not E??
(e) does not address the dispositive yet unknown issue, which is whether of the population of male soccer players has grown at the same rate, or a faster rate, as has the population of female soccer players.

since this choice has nothing to do with male soccer players, it is irrelevant to the question at hand.
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by kevincanspain » Sun Mar 21, 2010 8:14 am
This used to be an GMAT Paper Test question about the proportion of women among students enrolled in higher education programs, but it has been reworded. It's too bad the person who rewrote it doesn't have better writing skills...
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by reply2spg » Tue Mar 23, 2010 8:32 am
This is a mirror copy of one of the CR questions in OG. Answer is indeed A.
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