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Sajjad1994
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statement 1 weakens the statement
statement 2 neither strengthen nor weakens the argument it just provides facts
statement 3 strengthen the argument
statement 4 again the fact irrelevant
Statement 5 does not affect the conclusion in any way
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Sajjad1994
Official Explanation

If the researchers had posed the same questions to 5-year-old French and Mundurucú children as they posed to the 7-to-13-year-old children, the results may or may not have corroborated the researchers’ conclusion.

If, however, the Mundurucú children who were 5 years old had the same difficulty in answering the questions as their North American counterparts, then the researchers would have further evidence that the ability is not present in children under the age of 5 but appears to develop thereafter.

The correct answer is Mundurucú children who were 5 years old had just as much trouble answering the questions as did the 5-year-old North American children.

If it were true that North American children 7 to 13 years old had much more trouble answering the questions than did the Mundurucú of the same ages, then this would provide some evidence that the ability is not innate.

The correct answer is North American children 7 to 13 years old had much more trouble answering the questions than did the Mundurucú of the same ages.

hi Sajjad1994

what's the problem of D? if the difficult level is same, then it is more likely to be innate.
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what's the problem of D? if the difficult level is same, then it is more likely to be innate.

With respect to the conclusion of the argument, D is unrelated, as it neither strengthens nor weakens the argument.
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zoezhuyan
Sajjad1994
Official Explanation

If the researchers had posed the same questions to 5-year-old French and Mundurucú children as they posed to the 7-to-13-year-old children, the results may or may not have corroborated the researchers’ conclusion.

If, however, the Mundurucú children who were 5 years old had the same difficulty in answering the questions as their North American counterparts, then the researchers would have further evidence that the ability is not present in children under the age of 5 but appears to develop thereafter.

The correct answer is Mundurucú children who were 5 years old had just as much trouble answering the questions as did the 5-year-old North American children.

If it were true that North American children 7 to 13 years old had much more trouble answering the questions than did the Mundurucú of the same ages, then this would provide some evidence that the ability is not innate.

The correct answer is North American children 7 to 13 years old had much more trouble answering the questions than did the Mundurucú of the same ages.

hi Sajjad1994

what's the problem of D? if the difficult level is same, then it is more likely to be innate.

D seems to be the underlying assumption for the researcher's conclusion to hold true. It doesn't strengthen/weaken the argument.
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Given: An experiment tested basic geometric knowledge among three groups:
  • Groups of children and their performance:
    • Group 1: Mundurucu children (7–13 years, no formal geometry training)
    • Group 2: French children (7–13 years, formal geometry training)
    • Group 3: North American children (5 years, no formal geometry training)
  • Groups 1 and 2 answered questions equally quickly and accurately.
  • Researchers’ conclusion: Basic geometric knowledge is innate but develops only after age 5.

To Find:
  • The statement that most strengthens the researcher’s conclusion.
  • The statement that most weakens this conclusion.

Solution:

First note that:
  • To strengthen, we need a statement that supports:
    • Geometric knowledge is innate.
    • But it emerges only after age 5.
  • To weaken, we need a statement that suggests geometry ability depends on learning, not innateness.

Let’s evaluate all statements carefully to find the ones that best our characterization above:

Statement 1: North American children 7 to 13 years old had much more trouble answering the questions than did the Mundurucu of the same ages.
  • This weakens the idea of innate ability that develops after 5. If there really is innate ability and it does develop after 5, then the North Americans children should have performed similarly to the Mundurucu children of the same age.
  • Potential Weakener

Statement 2: None of the 5-year-old North American children had ever studied any geometry.
  • Neutral — does not affect the conclusion about innate knowledge after age 5 (expected for 5-year-olds).

Statement 3: Mundurucu children who were 5 years old had just as much trouble answering the questions as did the 5-year-old North American children.
  • This supports the conclusion. It shows that before age 5, children from both groups (one trained, one not) struggle equally — suggesting the knowledge is innate but not fully developed till after age 5.
  • Strong Strengthener

Statement 4: The researchers posed the same questions to 5-year-old French and Mundurucu children as they posed to the 7-to-13-year-old children.
  • Neutral — just describes methodology.

Statement 5: Most of the children studied answered one or more of the questions incorrectly.
  • Neutral — does not affect the age-based innate ability conclusion.

Correct Answer:
  1. Most Strengthen: Statement 3
  2. Most Weaken: Statement 1

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