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Government statistics show that the real (adjusted for inflation)

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Government statistics show that the real (adjusted for inflation)  [#permalink]

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New post 14 Aug 2018, 06:20
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  45% (medium)

Question Stats:

61% (01:34) correct 39% (01:43) wrong based on 87 sessions

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Government statistics show that the real (adjusted for inflation) average income for families has risen over the last five years. Therefore, since this year the Andersen family's income is average for families, the family's real income must have increased over the last five years.

The reasoning in the argument is most vulnerable to criticism on the grounds that the argument

(A)  ambiguously uses the term "average" in two different senses 


(B)  fails to take into account inflation with respect to the Andersen family's income 


(C)  overlooks the possibility that most families' incomes are below average 


(D)  fails to consider the possibility that the Andersen family's real income was above average in the recent past

(E)  presumes, without providing justification, that the government makes no errors in gathering accurate estimates of family income

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Re: Government statistics show that the real (adjusted for inflation)  [#permalink]

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New post 14 Aug 2018, 20:19
Government statistics show that the real (adjusted for inflation) average income for families has risen over the last five years. Therefore, since this year the Andersen family's income is average for families, the family's real income must have increased over the last five years.

In last five years the average income has increased. The average income of family A is equal to the average of all families. therefore, the income of family A would have increased in last 5 years
Flaw :- clearly the flaw is that it fails to address the initial income for family A. what if the income initially was above average

The reasoning in the argument is most vulnerable to criticism on the grounds that the argument

(A)  ambiguously uses the term "average" in two different senses
average is used correctly

(B)  fails to take into account inflation with respect to the Andersen family's income
This is not correct

(C)  overlooks the possibility that most families' incomes are below average
Does not effect the argument

(D)  fails to consider the possibility that the Andersen family's real income was above average in the recent past
Correct. Say the average for all has increased from 100 to 150 in last 5 years, so now the average income of family A is 150.
But what if earlier it was 200, so there is a drop from 200 to 159


(E)  presumes, without providing justification, that the government makes no errors in gathering accurate estimates of family income
Out of scope

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Re: Government statistics show that the real (adjusted for inflation)   [#permalink] 14 Aug 2018, 20:19
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