Difficulty: Easy

Average Score: 78%

Which of the following statements best exemplifies the use of sound reasoning?

Rationale

Since salamanders are amphibians and all amphibians are cold-blooded, salamanders are cold-blooded.

This statement exemplifies sound reasoning through the application of a general principle to a specific case, demonstrating a valid logical deduction based on established biological classifications.

A (Since ocean temperature in the summer is usually 75 degrees, the water will be about 75 degrees when we go to the beach this summer.) YOUR ANSWER

This statement relies on an assumption that summer temperatures will hold true without accounting for variations in local weather or ocean conditions. It lacks definitive reasoning and does not represent a universally applicable principle, making it less sound than the correct answer.

B (Since every child I babysit likes to play with blocks, all children must like playing with blocks.) YOUR ANSWER

This reasoning is flawed as it generalizes from a limited sample size to all children. It overlooks the variability in preferences and experiences among different children, which undermines the validity of the conclusion drawn.

C (Since John and Dane are on the track team together, both must also be good sprinters.) YOUR ANSWER

This conclusion assumes that being on the same team guarantees a shared level of skill, which is not necessarily true. There are many factors that contribute to athletic ability, making this reasoning speculative rather than logically sound.

Conclusion

Sound reasoning involves deriving a conclusion from a general rule or principle that is widely accepted and applicable. The correct answer demonstrates this by logically inferring that salamanders, being amphibians, must share the cold-blooded characteristic of their classification. In contrast, the other choices illustrate various forms of faulty reasoning, either through overgeneralization or unfounded assumptions. Effective reasoning hinges on the reliable application of established knowledge, which is clearly exhibited in the correct statement regarding salamanders.

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