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cr-heart attack

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Senior Manager
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cr-heart attack [#permalink] New post 02 Feb 2007, 07:54
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Of 2,500 people who survived a first heart attack, those who did not smoke had their first heart attack at a median age of 62. However, of those 2,500, people who smoked two packs of cigarettes a day had their first heart attack at a median age of 51. On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.
The conclusion is incorrectly drawn from the information given because this information does not include
(A) the relative severity of heart attacks suffered by smokers and nonsmokers
(B) the nature of the different medical treatments that smokers and nonsmokers received after they had survived their first heart attack
(C) how many of the 2,500 people studied suffered a second heart attack
(D) the earliest age at which a person who smoked two packs a day had his or her first heart attack
(E) data on people who did not survive a first heart attack
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Re: cr-heart attack [#permalink] New post 02 Feb 2007, 08:15
AK47 wrote:
Of 2,500 people who survived a first heart attack, those who did not smoke had their first heart attack at a median age of 62. However, of those 2,500, people who smoked two packs of cigarettes a day had their first heart attack at a median age of 51. On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.
The conclusion is incorrectly drawn from the information given because this information does not include
(A) the relative severity of heart attacks suffered by smokers and nonsmokers
(B) the nature of the different medical treatments that smokers and nonsmokers received after they had survived their first heart attack
(C) how many of the 2,500 people studied suffered a second heart attack
(D) the earliest age at which a person who smoked two packs a day had his or her first heart attack
(E) data on people who did not survive a first heart attack


The sample is exclusively composed of people who have survived their first heart attack. But the conclusion says that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.

This conclusion cannot be validated unless we survey the date of the attack for people who did not survive their 1st heart attack.

D.
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Re: cr-heart attack [#permalink] New post 02 Feb 2007, 09:39
I think you mean E! good explaination.

ncprasad wrote:
AK47 wrote:
Of 2,500 people who survived a first heart attack, those who did not smoke had their first heart attack at a median age of 62. However, of those 2,500, people who smoked two packs of cigarettes a day had their first heart attack at a median age of 51. On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.
The conclusion is incorrectly drawn from the information given because this information does not include
(A) the relative severity of heart attacks suffered by smokers and nonsmokers
(B) the nature of the different medical treatments that smokers and nonsmokers received after they had survived their first heart attack
(C) how many of the 2,500 people studied suffered a second heart attack
(D) the earliest age at which a person who smoked two packs a day had his or her first heart attack
(E) data on people who did not survive a first heart attack


The sample is exclusively composed of people who have survived their first heart attack. But the conclusion says that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.

This conclusion cannot be validated unless we survey the date of the attack for people who did not survive their 1st heart attack.

D.
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Re: cr-heart attack [#permalink] New post 02 Feb 2007, 09:41
arj_singh1976 wrote:
I think you mean E! good explaination.

ncprasad wrote:
AK47 wrote:
Of 2,500 people who survived a first heart attack, those who did not smoke had their first heart attack at a median age of 62. However, of those 2,500, people who smoked two packs of cigarettes a day had their first heart attack at a median age of 51. On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.
The conclusion is incorrectly drawn from the information given because this information does not include
(A) the relative severity of heart attacks suffered by smokers and nonsmokers
(B) the nature of the different medical treatments that smokers and nonsmokers received after they had survived their first heart attack
(C) how many of the 2,500 people studied suffered a second heart attack
(D) the earliest age at which a person who smoked two packs a day had his or her first heart attack
(E) data on people who did not survive a first heart attack


The sample is exclusively composed of people who have survived their first heart attack. But the conclusion says that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.

This conclusion cannot be validated unless we survey the date of the attack for people who did not survive their 1st heart attack.

D.


Oops. Of course, I meant E. :wink:
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Re: cr-heart attack [#permalink] New post 03 Feb 2007, 09:00
good explanation nc prasad.

oa is E
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 [#permalink] New post 20 Feb 2007, 08:06
Cofused and selected 'D'.

The conclusion is not severity of heart attacks but finding the avarage age.

It clearly says:

"On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day"

Unless we know the number of years any person smokes 2 pack of cigarettes, it would be difficult to calculate the avarage years smoked before the 1st heart attack.

Therefore, average age of heart attack does not support the conclusion.
  [#permalink] 20 Feb 2007, 08:06
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