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Difficulty: MediumFlaw in the Reasoning

Consider the following argument and the claim about its reasoning.

Argument:
Food Scientist: A successful sourdough starter always contains a healthy balance of wild yeast and lactic acid bacteria. This new batch of starter we cultivated in the lab has an optimal balance of wild yeast and lactic acid bacteria. Therefore, this new batch is guaranteed to be a successful sourdough starter.

Claim:
The reasoning in the food scientist's argument is flawed because it treats a condition that is required for a certain outcome as though it were sufficient to guarantee that outcome.

Is this claim true or false?

Answer: Answer

Answer

True
The claim correctly diagnoses the logical error. The first premise establishes that a healthy balance of yeast and bacteria is a prerequisite for a successful starter. The conclusion then baselessly assumes that because this baseline requirement is met, the outcome is guaranteed, effectively treating a mere necessary condition as if it were a sufficient condition.

Step-by-Step Solution

1
Analyze the structure of the original argument to identify its premises and conclusion.
Premise: A successful starter always contains a healthy balance (Success implies Balance). Premise: The new batch has this balance. Conclusion: The new batch will be successful (Balance implies Success).
Deconstructing the argument is necessary to map the logical flow and spot any flawed conditional relationships.
2
Evaluate the relationship between the premises and the conclusion to find the logical gap.
The argument affirms the necessary condition (having the correct balance) and incorrectly uses it to affirm the sufficient condition (guaranteeing success).
Identifying how the conclusion oversteps the premises reveals the exact nature of the logical flaw.
3
Compare the identified logical gap against the provided claim.
The claim states the argument treats a required condition as sufficient, which perfectly matches the illegal reversal gap identified in the previous step.
To determine if the claim about the flaw is true, it must accurately describe the structural error made in the stimulus.

Key Concept

Logical Flaws: Confusing Necessary and Sufficient Conditions
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Topics

Flaw in the Reasoning

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