shailendrasharma wrote:

A new private college offers a course which prepares students for a career in which only 7% of the professionals are successful financially in the related industry. In a radio commercial, the course is presented as a guarantee to financial success based on that career. Clearly, such a guarantee warrants charges of false advertising.

The answer to which of the following would be most useful in evaluating the argument?A) Is the percentage of professionals that did not take part in the course in the new private college lower than 93%?

B) Did any of the professionals included in the 7% not graduate from the course?

C) Did more than 50% of the professionals graduate from a similar course offered by another college?

D) How many students does the college accept into a single course?

E) What percentage of professionals have participated in a course that trains for this specific career?

Source: gmat.babson.edu

Responding to PM.

I would look at options A and B.

We are given that:

1. 7% of professionals are successful in Industry X (say)

2. Course says guaranteed financial success

3. Conclusion: Incorrect advertising. In other words, 100% success rate not possible.

Let's talk in numbers here. Suppose, 1000 people enter industry X every year. So, 70 of them get successful.

Now, if the number of students in the course in 71, can course provide guaranteed success? The answer is No. Because in such a case, at least one was unsuccessful. So, the number of students in the course should not exceed 7% of the professionals.

This is what option A seeks to find and is thus correct.

Option B:

B) Did any of the professionals included in the 7% not graduate from the course?

It wants to find out if there is any guy who did not take the course but was successful. We are not concerned about such guys - they can be successful or they can be failures. That does not impact the conclusion or the advertisement of the course.

Other way to look at option B is by answering Yes and No to it.

If the answer to option B is yes, then there are people who did not take the course but were successful. Does that affect course's claim to provide guaranteed success? The answer is No. The course is not saying that you cannot be successful without the course. It is just saying that if you take the course, you will be successful.

If the answer to option B is No, then there are no people who did not take the course and were successful. But does this mean that all the people who took the course were successful? The answer is No.

So, either a Yes or No to the question does not weaken or strengthen the argument. Therefore, option B is incorrect.

Thanks,

Chiranjeev

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