Critical Reasoning

vinni.k wrote:Market researchers recently reported that ninety percent of the people interviewed objected to a particular detergent's advertisement because of their portrayal of women. Yet this detergent is purchased by twenty percent of consumers. So its advertisements must be considered to be unobjectionable to at least twenty percent of consumers.

The conclusion of the argument above depends on which of the following assumption?

a) People who object to a product's advertisements may still buy that product.

b) The people who buy this detergent are familiar with its advertisement.

c) Most of the people who do not buy this detergent consider its advertisements to be objectionable.

d) Most people wash their own clothes, so they have to buy some brand of detergent.

e) Most of the people in the market research study were women.

vinni.k wrote: Please check my analysis on C. I am very confused. I have made two cases. In case 1, if 144(MOST) of the objected consumers didn't purchase, then C seems to satisfy as an assumption

In case 2, If 144 (MOST) of the objected consumers purchase, then C doesn't seems to be an assumption.

I will really appreciate if you look into my analysis. I was very confused between B and C, and could not eliminate C. At the time of review i made 2 cases, so just want to know whether i am correct or not. If you think i am missing something or if it is wrong, then feel free to correct me

Thanks
Vinni

GMATGuruNY wrote: C, negated:
Most non-purchasers consider the advertisements unobjectionable.
If anything, this negation STRENGTHENS the conclusion that the advertisements are considered unobjectionable to at least twenty percent of consumers.
Since the negation of C does not invalidate the conclusion, eliminate C.

Marty Murray wrote:
The first is that what (C) says is not strongly supported by the statements in the argument. All we know is that 90 percent of those interviewed objected to the advertisement. For all we know, the people interviewed are the only people ever to have seen the advertisement. Alternatively, the opinions of the people interviewed may not match those of the general population. At the same time, (C) is not clearly in conflict with what is said in the argument.

vinni.k wrote:

GMATGuruNY wrote: C, negated:
Most non-purchasers consider the advertisements unobjectionable.
If anything, this negation STRENGTHENS the conclusion that the advertisements are considered unobjectionable to at least twenty percent of consumers.
Since the negation of C does not invalidate the conclusion, eliminate C.

The argument concludes that 20% of consumers consider the ads unobjectionable.
Every consumer is either a purchaser of the detergent or a non-purchaser.
The negation of C states that most non-purchasers find the ads unobjectionable, implying that a significant portion of CONSUMERS find the ads unobjectionable.
This information -- that a significant portion of consumers find the ads unobjectionable -- STRENGTHENS the conclusion that at least 20% of consumers consider the ads unobjectionable.
Since the negation of the correct answer must invalidate the conclusion, eliminate C.

vinni.k wrote:

Marty Murray wrote:
The first is that what (C) says is not strongly supported by the statements in the argument. All we know is that 90 percent of those interviewed objected to the advertisement. For all we know, the people interviewed are the only people ever to have seen the advertisement. Alternatively, the opinions of the people interviewed may not match those of the general population. At the same time, (C) is not clearly in conflict with what is said in the argument.

Marty, i have no issues with B, and i have understood clearly. Okay let me tell you what i have understood from the argument.

Detergent is bought by 20% of consumers. So, its advertisement must be unobjectionable to at least 20% of consumers.

It is unobjectionable to at least 20% of consumers who bought detergent
and the confusing part - if it is unobjectionable as above mentioned, then it is objectionable to 80%(or less) who bought detergent or not bought detergent.

Summary
It is unobjectionable to at least 20% of consumers who bought detergent
it is objectionable to 80%(or less) who bought detergent or not bought detergent. (confused underlined part)

This is where i am mixing C with this part

vinni.k wrote:One more question. When evaluating answer choices for an assumption question and confused between 2 or 3 answer choices, then we should check which one more closely bridges the gap. Like in this question choice B completely makes sense because here if people are not familiar with the advertisement, then there is no question of being objectionable or unobjectionable. So, it bridges the gap and more clear as an answer.

In C, i was thinking of 80%, but the gap has to be filled with the 20%. So, if i get confused in such answer choices, then i should check which one is bridging the gap and go for it.

Please let me know if i am correct.

Also i usually don't go for negation in the first place because it doesn't strike me quickly, second i feel it to be time consuming.