Hard CR questions involving proportion/numbers/statistics

Again, there were probably choices that argued the numberof Kravonians with a college degree more than the choices provided and increases the risk of being wrong from the remaining choices. C still has a direct relation

3. C

4 D well hidden that per issue advertising is constant and that means half the ad revenues

5 C a silly one because percentages of divisional profits will add up to 100 and here we see the second division contributing higher percent based on poor profits of other
6. D as each lost job salary has to be deducted from the average calculation of remining jobs and if it was average then the added higher pay jobs would increase the average salary for the citizens
7. C, unfortuntely it cannot be E because though it would explain it more closer to the requirement of the argument that dealers reported variant daata, fact is the argument already stated that directly revenues were being compared which dealers said ahd increased for Denoma

8. C again A,B and D are easily eliminated but E is iagonally oposite in impact to the argument but is not provable without more data in this case as C is already poducing the same positive variation (improvement) in reclamation costs (going down)

Quote:

9. For the first time in history, more televisions than people can be found in American households. According to recent research, the average household has 2.55 residents and contains 2.73 televisions. However, by employing such costly manufacturing processes as plasma technology and flat screens, televisions are becoming too expensive for the typical consumer. As a result, the average number of residents per household will again surpass the number of televisions.

Which of the following, if true, most strongly supports the argument above?

A. House parties at which numerous individuals gather to view popular television shows on one television set have increased three hundred percent during the past year.
B. More than one million legal immigrants enter the United States each year.
C. New devices such as video-enabled personal digital assistants and music players are increasingly purchased for use as a primary source of information and entertainment.
D. As new technologies become more commonplace, manufacturing and retail costs normally decline.
E. As a result of technological advances, new televisions are increasingly enabled with some features, such as Internet browsing, traditionally associated with other household devices.

A. could be from any small base but keeper as it impacts argument directly
B. indirect argument, needs substantiation
C. cost of new devices not known and whether they reduce the installs of TV
D. weakens argument as it would increase number of new tv sold
E. irrelevant to argument

Still left with A

9. A

9. corection still left with A and C, i chose A an 'error' I keep finding more logical as Kaplan 800 repeats this kind of erroneous incomplete set with two incomplete choices and solution based on environment outside the argument

I was able to solve the 9th one ( not in the first attempt ) by POE. The answer could be reduced to 'C' but I am not convinced the reasoning of 'C'.

The argument is about the impact on Number of residents Vs Number of TV sets
A. House parties, at which numerous individuals gather to view popular television shows on one television set, have increased three hundred percent during the past year.
If household parties have increased, then more than anything this should weaken the argument as the people throwing the party would tend to buy additional TV's instead of cramping everyone at one place

B. More than one million legal immigrants enter the United States each year.
No impact on the number

C. New devices such as video-enabled personal digital assistants and music players are increasingly
purchased for use as a primary source of information and entertainment.
By POE, only this option remains, Nevertheless, let’s see how it impacts the number
The topic of entertainment is not given in the passage. This sentence implies that People will start buying PDA and Music players instead of TV’s.
Here's the problem: Passage says, people will stop buy TV due to advanced technology which will make it costly, The Option C says that people have started buying PDA's or Music players for entertainment and hence Number of TV's in a house will drop. The topic of entertainment seems off the argument.

Can someone please help me in reasoning out this Option

D. As new technologies become more commonplace, manufacturing and retail costs normally decline.
Weakens the argument. This will enable people to buy more television sets

E. As a result of technological advances, new televisions are increasingly enabled with some features, such as Internet browsing, traditionally associated with other household devices.
Weakens the argument. This will enable people to buy more television sets

Hi All,

Need a help on Problem 6th, Mayor Delmont

The option B says "Average pay in the city was at a ten-year low when Mayor Delmont took office."
The conclusion says that "throughout Delmont’s tenure the average paycheck in this city has been getting steadily bigger. "

So can't we say that the average pay check before Delmont was lower and that it started to increase when he took office, so in effect this strengthens the argument.

I found it difficult to justify Between 'D' and 'B'. Please explain the difference

I took the GMAT Prep test yesterday and this question was on it. However, the answer does not seem right, actually none do. The question states "Eventually" - "Therefore, the number of Kravonians entering the job market who have at least the qualification of a college degree will eventuallty be significantly higher than it has been over the last few years" So even if they stay in college longer, they will eventually come out with a degree and enter the workforce. Your thoughts on this please.

Thanks

1. percentage of people moving in decreased. How about the total number of people moving in to Florida? Has it increased ? If so it can offset this decrease, weakening the conclusion.
2. 60% and 10% increase. We don't need to worry about total # of residents here as the questions already takes a per 1000 figure. what if in the beginning Meadowbroke had a 1% rate and Parkdale had a 75% figure. Then the conclusion fails.
3. Number of Kravonians enrolled has grown, so more kravnian college graduates. What if the growth is not attributable to new students but rather existing students spending more time to graduate?
4. reduce the number of issues is how Home Décor plans to maximise profits? so, assumption is the plan wont have any negative effects. But option D says that advertisers will continue to spend the same amount per issue as before. So Home Décor is looking at half the revenue from advertising as before.
5. Officer is quoting percentages, without giving actual profits in either year. It is not possible to make a logical conclusion from just percentages. If the total profits reduced, but pharmaceutical made roughly the same profit as previous year. the percentage contribution can increase.
6. Average paycheck has increased. Something which says that that may not necessarily be the case will weaken the conclusion. if the average paycheck of the jobs removed is equal to jobs citywide, then the increase in paycheck is compensated because of new jobs is compensated, negating the politicians claim.
7. Denoma sales revenue decreased significantly eventhough, its consumer products sold very well. consumer products are only a minor part of its sales portfolio. It sells mainly to wholesalers.
8. Surface mine technology has not improved but cost has reduced. So the current technology is being used more cost effectively? reducing mining in Mountainous areas helps.
9. Average number of people per household will increase than the average tv per household. why? TV is becoming more expensive? so people wont buy them? is cost a factor in peoples tv buying style? what is the trend in people's buying habits currently?

carcass souvik101990 bb nightblade354 GMATNinja is this still the most comprehensive list of CR Numbers & Ratios questions that is available here on gmatclub.com? There is a "Numbers & Percent" filter in CR, but it gives no results when applied to LSAT, OG, and Manhattan question banks.

Thanks in advance.

carcass , @brunei or ANYONE I'm so stumped on the explanation of this related proportion CR problem. Any guidance at all would be great. I cannot wrap my head around and reapply the concept of how to compare changes in parts of the whole when you have increase of a smaller absolute amount of one that represents a larger change in its ratio to the total:

Epidemiologist: In Brazil, schistosomiasis and malaria are the two most common infectious diseases. Over the past five years, schistosomiasis has been primarily responsible for the overall increase in infectious disease cases. Therefore it is likely that there were more cases of schistosomiasis than malaria five years ago.

Which of the following most strengthens the argument above?

(A) Over the past five years, the percentage of infectious disease cases caused by schistosomiasis has remained unchanged, but the percentage of cases caused by malaria has increased substantially.
(B) Trends in infectious disease data tend to persist for decades, unless there is a major breakthrough in treatment regimens.
(C) Five years ago, many more people died from schistosomiasis than died from malaria.
(D) Over the past five years, the percentage of infectious disease cases caused by malaria was not significantly greater than the percentage of cases caused by schistosomiasis.
(E) Over the past five years, the percentage of infectious disease cases caused by diseases other than malaria and schistosomiasis did not increase substantially.

Solution
The logic in the original argument is clearly flawed. You are given two premises: 1. The total number of infectious disease cases is growing (in other words the size of the pie has increased), and 2. Of those new cases, schistosomiasis accounts for the greatest number. Then the conclusion erroneously states that there were likely more cases of schistosomiasis than malaria 5 years ago. There is a huge gap between the two premises and the conclusion. What if, if for instance, there were 5000 cases of malaria 5 years ago and 1,000 cases of schistosomiasis. In the past 5 years, there could have been 500 new cases of schistosomiasis and only 100 new cases of malaria. Then you have met all the conditions given by the premises (the total has increased and schistosomiasis has accounted for a majority of those cases) but there were clearly more malaria cases than schistosomiasis cases 5 years ago. You need something that removes this possibility and increases the likelihood that there were more cases of schistosomiasis than malaria 5 years ago. Answer choice (A) does this perfectly (it guarantees the conclusion), but it is very difficult to comprehend because of the difficult presentation of data. Combining (A) with the premises in the original stimulus, you know that schistosomiasis accounted for the most number of new cases over the past five years AND its percentage of the pie remained unchanged. Malaria accounted for fewer new cases AND its percentage of the pie INCREASED. This means that there must have been more cases of schistosomiasis 5 years ago than malaria cases. If there had been more malaria cases, then an increase in its percentage of an increasing pie would have meant that it accounted for more new cases than schistosomiasis. (B) and (C) are relatively easy to eliminate because the death rates are not relevant and the trends may or may not have changed over the time period as you know nothing about what has happened with treatment regimens. (D) is the difficult sucker choice and is the opposite of answer choice. You need the percentage of new cases to be higher for malaria in order to prove this conclusion, so (D) is wrong. In (E) the percentage of other infectious diseases is not important, as it does not affect the important relationships between malaria and schistosomiasis in this conclusion. Answer is (A).

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