Step 1: Understand the Argument
Premise: The more formally a person is dressed, the older the average observer will gauge that person to be.
Conclusion: The average observer will generally estimate a man in a business suit to be five years older than a man wearing casual clothing.
Assumption: The argument assumes that the observer's perception of age is influenced solely by the attire and that the ages of the two men are comparable or the same, allowing for a fair comparison. The conclusion hinges on the idea that the only variable affecting the perceived age difference is the clothing.
Step 2: Identify the Task
The question asks for the condition that would make the conclusion more properly drawn. In other words, we're looking for an answer choice that, if true, would strengthen the conclusion or remove any ambiguity that might affect the conclusion's validity.
Step 3: Analyze Each Answer Choice
A. The age of the man wearing the business suit is greater than that of the man wearing casual clothing.
Analysis: If the man in the business suit is older, then the observer's perception might be correct because of the actual age difference, not necessarily because of the attire. This does not strengthen the argument that attire alone influences perceived age.
Conclusion: This does not make the conclusion more properly drawn.
B. The older a man is, the more likely it is that he will wear a business suit.
Analysis: This statement might explain why older men tend to wear business suits, but it doesn't directly address the observer's perception based solely on attire. The argument focuses on attire influencing perceived age, not on actual age or likelihood of wearing a suit.
Conclusion: This is irrelevant to the argument.
C. The age of the man wearing the business suit is equal to the age of the man wearing casual clothing.
Analysis: This choice aligns with the assumption that the ages of the two men are the same, making attire the only variable affecting the observer's perception. If the men are the same age, then any perceived age difference must be due to the clothing, which strengthens the argument's conclusion.
Conclusion: This makes the conclusion more properly drawn.
D. The average observer's estimates of age are generally more accurate regarding casually dressed people than formally dressed people.
Analysis: This choice suggests that observers are better at estimating the age of casually dressed people than those in formal attire. While this might indicate a potential bias in age estimation, it does not directly strengthen the conclusion that attire influences perceived age. It introduces a different variable (accuracy) rather than focusing on the attire alone.
Conclusion: This does not strengthen the argument.
E. The average observer's estimates of age are generally more accurate regarding formally dressed people than casually dressed people.
Analysis: Similar to choice D, this choice focuses on the accuracy of the age estimates. It suggests that observers are better at estimating the age of formally dressed people, but it doesn't directly impact the argument about how attire influences perceived age. It shifts the focus away from the impact of clothing on perception.
Conclusion: This does not strengthen the argument.
Step 4: Conclusion
The correct answer is C. The age of the man wearing the business suit is equal to the age of the man wearing casual clothing.
Why? This choice ensures that the only factor influencing the observer's perception of age is the attire, making the argument's conclusion more properly drawn. If both men are the same age, then the perceived age difference must be attributed to their clothing, which supports the argument that formal attire makes a person appear older.