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According to a 1980 survey, ten percent of all United States

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Manager
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According to a 1980 survey, ten percent of all United States [#permalink] New post 15 Dec 2004, 12:45
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According to a 1980 survey, ten percent of all United States citizens over the age of sixteen are functionally illiterate. Therefore, if the projection that there will be 250 million United States citizens over sixteen in the year 2000 is correct, we project that 25 million of these citizens will be functionally illiterate.

Which of the following, if true, would most weaken the conclusion drawn by the author of the passage above?

(A) The percentage of high school graduates who do not go on to college has grown steadily over the past two decades.
(B) From 1975 to 1980 there was a three-percent decrease in the rate of functional illiteracy among United States citizens over the age of sixteen.
(C) Many United States citizens included in the 1980 survey would be also included in a survey conducted in the year 2000
(D) Surveys that are improperly designed usually provide inaccurate results.
(E) In 1980 sixty-five percent of all United States citizens were over the age of sixteen.
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 [#permalink] New post 06 Apr 2006, 03:28
My answer is B
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 [#permalink] New post 06 Apr 2006, 03:41
I think it shud be B

It shows that the %-age is not a fixed value, over the years! So u cannot project accurately!
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 [#permalink] New post 06 Apr 2006, 03:43
I am going with B.
From 75 to 80, the figure changed. So maybe, in the 80's also, the figure will change.
  [#permalink] 06 Apr 2006, 03:43
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According to a 1980 survey, ten percent of all United States

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