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nightblade354
All the evidence so far gathered fits both Dr. Grippen's theory and Professor Heissmann's. However, the prediction that these theories make about the result of the planned experiment cannot both be true. Therefore, the result of this experiment will confirm one of these theories at the expense of the other.

The argument above exhibits an erroneous pattern of reasoning most similar to that exhibited by which one of the following?

(A) David and Jane both think they know how to distinguish beech trees from elms, but when they look at trees together they often disagree. Therefore, at least one of the must have an erroneous method

(B) Although David thinks the tree they saw was a beech, Jane thinks it was an elm. Jane's description of the tree's features is consistent with her opinion, so this description must be inconsistent with David's view

(C) David and Jane have been equally good at identifying trees so far. But David says this one is an elm, whereas Jane is unsure. Therefore, if this tree turns out to be an elm, we'll know David is better

(D) David thinks that there are more beeches that elms int he forest. Jane thinks he is wrong. The section of forest we examined was small, but examination of the whole forest would either confirm David's view or disprove it

(E) David thinks this tree is a beech. Jane thinks it is an elm. Maria, unlike David or Jane, is expert at tree identification, so when Maria gives her opinion it will verify either David's or Jane's opinion

Passage Analysis:
A:Dr. Grippen's theory B: Professor Heissmann's theory
we have A and B theories -> given evidence so far are consistent with both theories -> but both can't be true -> so we perform another experiment which confirms one of these theories and proves the other wrong.

A: David B: jane

A. David and Jane both think they know how to distinguish beech trees from elms, but when they look at trees together they often disagree. Therefore, at least one of the must have an erroneous method
A and B theories to distinguish trees -> both "often" give different output -> so one of them is wrong There is no final experiment to identify which is correct theory

(B) Although David thinks the tree they saw was a beech, Jane thinks it was an elm. Jane's description of the tree's features is consistent with her opinion, so this description must be inconsistent with David's view
Says B is inconsistent with A but doesn't say whether one is wrong and other is right

(C) David and Jane have been equally good at identifying trees so far. But David says this one is an elm, whereas Jane is unsure. Therefore, if this tree turns out to be an elm, we'll know David is better
here we have a final experiment to check only A's output, as jane is unsure we don't have a B output

(D) David thinks that there are more beeches that elms int he forest. Jane thinks he is wrong. The section of forest we examined was small, but examination of the whole forest would either confirm David's view or disprove it
this is a close one!
we have A and B theories->but the results so far can't be consistent with both
After a small portion of the forest is checked(i.e, "the evidence so far"), the no of beeches is either greater or lesser than elms. This result is not consistent with both A and B theories.

(E) David thinks this tree is a beech. Jane thinks it is an elm. Maria, unlike David or Jane, is expert at tree identification, so when Maria gives her opinion it will verify either David's or Jane's opinion[/quote]
we have A and B theories -> both A and B can't be true -> so take other experiment(with maria) to confirm one theory and conclude the other as wrong

IMO the answer is E
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nightblade354
All the evidence so far gathered fits both Dr. Grippen's theory and Professor Heissmann's. However, the prediction that these theories make about the result of the planned experiment cannot both be true. Therefore, the result of this experiment will confirm one of these theories at the expense of the other.

The argument above exhibits an erroneous pattern of reasoning most similar to that exhibited by which one of the following?

(A) David and Jane both think they know how to distinguish beech trees from elms, but when they look at trees together they often disagree. Therefore, at least one of the must have an erroneous method

(B) Although David thinks the tree they saw was a beech, Jane thinks it was an elm. Jane's description of the tree's features is consistent with her opinion, so this description must be inconsistent with David's view

(C) David and Jane have been equally good at identifying trees so far. But David says this one is an elm, whereas Jane is unsure. Therefore, if this tree turns out to be an elm, we'll know David is better

(D) David thinks that there are more beeches that elms int he forest. Jane thinks he is wrong. The section of forest we examined was small, but examination of the whole forest would either confirm David's view or disprove it

(E) David thinks this tree is a beech. Jane thinks it is an elm. Maria, unlike David or Jane, is expert at tree identification, so when Maria gives her opinion it will verify either David's or Jane's opinion

The stem mentions about "prediction" blah blah "both cannot be true"
So we need some external factor to make that call. A lacks that. A just mentions At least one of them will be true but why? No reason.

E overcomes that and bring Maria to decide between David and Jane.

Hence E over A.
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