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A recent census of all American females revealed that the current aver

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A recent census of all American females revealed that the current aver  [#permalink]

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New post 14 Feb 2019, 01:25
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58% (01:39) correct 42% (01:36) wrong based on 202 sessions

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A recent census of all American females revealed that the current average age that females in America marry is 27. The average age that females have their first child is also 27. According to a census taken 20 years ago, the average ages that females married and had their first child were 23 and 25 years, respectively.

If the information recorded in the two censuses is true, which of the following must also be true about American females?


(A) Currently, more females are having their first child before they marry than they did 20 years ago.

(B) On average, females are currently waiting longer to have their first child than they did 20 years ago.

(C) Females today are more likely to complete their education before getting married and having children than they were 20 years ago.

(D) On average, females had larger families 20 years ago than they have today.

(E) Twenty years ago, most females waited at least two years after they were married to have their first child.

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Re: A recent census of all American females revealed that the current aver  [#permalink]

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New post 26 Feb 2019, 02:25
Bunuel wrote:
A recent census of all American females revealed that the current average age that females in America marry is 27. The average age that females have their first child is also 27. According to a census taken 20 years ago, the average ages that females married and had their first child were 23 and 25 years, respectively.

If the information recorded in the two censuses is true, which of the following must also be true about American females?


(A) Currently, more females are having their first child before they marry than they did 20 years ago.

(B) On average, females are currently waiting longer to have their first child than they did 20 years ago.

(C) Females today are more likely to complete their education before getting married and having children than they were 20 years ago.

(D) On average, females had larger families 20 years ago than they have today.

(E) Twenty years ago, most females waited at least two years after they were married to have their first child.


OFFICIAL EXPLANATION:



B. This question asks you to come up with a conclusion based on the information in the paragraph.

Notice that the question asks you for what must be true rather than what could be true. So you can cross out any answers that aren’t absolutely true given the data in the paragraph.

All you know from the paragraph is the average marrying age for females today and 20 years ago and the average age that females have their first child today compared to 20 years ago. The paragraph says nothing about the number of children females have or had, so you can easily wipe Choice (D) out of contention. Furthermore, the paragraph provides no explanation for why the data has changed over the years, so you can’t know the reason that the average age has increased. So Choice (C) can’t be right.

Don’t choose an answer based on an assumption or your own experience. The paragraph merely reports data instead of commenting on it, and it treats the age of marrying and having one’s first child as two separate statistics. You can’t make assumptions about how the two sets of data are related.

That means that Choice (A) doesn’t have to be true. Just because the average age for marrying and having a first child are currently the same doesn’t mean that more American females are having their first child before they marry. For example, the increased marrying age could be the result of females who marry when they’re older and have no children. Eliminate Choice (E) for the same reason. You can’t assume from these limited statistics that the females who are 23 when they marry are the ones who are having their first child at 25. There are too many other variables in the population.

The only thing you know for sure is that, because the average age for having a first child has risen over the last 20 years, on average, females are having their first child at a later age than they did 20 years ago. Choice (B) is the only answer that must be true.
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Re: A recent census of all American females revealed that the current aver  [#permalink]

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New post 16 Feb 2019, 23:35
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Hi Mani,

Most and atleast have made this option irrelevant.

The argument just talk about the average.

If we go by the option E Most , it means few are still there who did not wait for atleast two year.

This is not mentioned anywhere in the argument.

Hope this explains.


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A recent census of all American females revealed that the current aver  [#permalink]

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New post 18 Feb 2019, 08:26
Hi,

I marked the answer to this question because answer choice B can be easily inferred. But I am not able to understand why the rest of the answer choices are incorrect.

Below is my analysis of the answer choices:

(A) Currently, more females are having their first child before they marry than they did 20 years ago. As per the given answer choice more women are having their first child before they marry, we cannot infer this since we just know that the average age is 27 in both the cases. On the basis of average we cannot come to this conclusion. We cannot infer more wowen are having their first child before they marry. It might be the case that there are 2 equal sizes groups that balances each other.

(C) Females today are more likely to complete their education before getting married and having children than they were 20 years ago. - Nothing about education is mentioned in the passage. Hence, out of scope.

(D) On average, females had larger families 20 years ago than they have today. - Not mention of familt size in the passage, hence out of scooe.

(E) Twenty years ago, most females waited at least two years after they were married to have their first child. Cannot be inferred on the basis of data given. We are just given the average.
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Re: A recent census of all American females revealed that the current aver  [#permalink]

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New post 29 Apr 2019, 16:40
Bunuel wrote:
A recent census of all American females revealed that the current average age that females in America marry is 27. The average age that females have their first child is also 27. According to a census taken 20 years ago, the average ages that females married and had their first child were 23 and 25 years, respectively.

If the information recorded in the two censuses is true, which of the following must also be true about American females?


This is a must be true question because the stimulus provides only data, but no conclusions. The stem asks us to draw the conclusion. So we should let the stimulus guide our answer choices.

(A) Currently, more females are having their first child before they marry than they did 20 years ago.
20 years ago, this was the case. But if on average, females today marry and have their first child at the same age, we cannot decipher which actually comes first from the information given

(B) On average, females are currently waiting longer to have their first child than they did 20 years ago.
Well, that's true based on the information given. Whether by choice or not, this is accurate. Let's move on to check.

(C) Females today are more likely to complete their education before getting married and having children than they were 20 years ago.
The prompt gives us no information about education. Sure, this could be true, but is not supported by the stimulus.

(D) On average, females had larger families 20 years ago than they have today.
No information in the stimulus is provided about the size of a family nor can we conclude such information.

(E) Twenty years ago, most females waited at least two years after they were married to have their first child.
This is tempting. The key is here that it says 'most.' Because these are averages, we cannot rely on the answer choice that includes 'most' because the stimulus does not provide this to us. 50% of females may have gotten married at 21 and the other 50% at 25, resulting in an average of 23. This shows us that we cannot conclude that 'most' is supported by the prompt.
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Re: A recent census of all American females revealed that the current aver   [#permalink] 29 Apr 2019, 16:40
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