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# In a study conducted in Pennsylvania,Servers in various

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In a study conducted in Pennsylvania,Servers in various [#permalink]

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29 Dec 2009, 05:24
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In a study conducted in Pennsylvania,Servers in various restaurants wrote "Thank you" on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if servers in Pennsylvania Regularly wrote "Thank you" on restaurant bills, their average income from tips would be significantly higher than it otherwise would have been.

Which of the following is an assumption on which the argument relies?

A. The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.

B. Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.

C. The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.

D. The rate at which people tip food servers in Pennsylvania Does not vary with how expensive a restaurant is.

E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.
[Reveal] Spoiler: OA

Last edited by Zarrolou on 21 Jul 2013, 22:02, edited 1 time in total.
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 06:25
Agree with C

Conclusion: "Thank you" message- Higher tip by Customer- Higher average income of servers.
Assumption is that which establishes a link between the message and the average income. C serves the purpose.
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 08:29
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I think it should be B. What's the OA?
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 08:40
Hi guys

Can we have some detailed explanations - preferably choice-wise

OA will follow
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 10:29
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The argument states that waiters who write "thank you" on the bill on average get 3% higher tips on checks than those who don't. Therefore, the waiters believes that if they will get a more tips if they write "thank you" on each receipt. The questions asks for the assumption that the waiter's belief relies upon.

A. The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant. The question does not distinguish between occassional and regular patrons. It only states that the patrons who see "Thank you" pay tip 3% higher than those who don't have "Thank you" on their checks.

B. Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.If this is true then it would not undermine the conclusion that people who see "thank you" will tip more.

C. The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers. This statement is not necessary because it touches upon the reason why people might pay more. ie. Patrons could be paying more bc the "Thank you" makes them think that their waiter is friendlier. This does not undermine the conclusion.

D. The rate at which people tip food servers in Pennsylvania Does not vary with how expensive a restaurant is. Out of scope.

E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.This is not an assumption made to draw the conclusion. This is the result of the study.
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 12:59
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I'm pretty sure it's E. Google it for me. I'm at work and can't access sites with the OA on them. This question was posted before on GMAT Club before, though. Here’s why I think it’s E.

Quote:
In a study conducted in Pennsylvania,Servers in various restaurants wrote "Thank you" on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if servers in Pennsylvania Regularly wrote "Thank you" on restaurant bills, their average income from tips would be significantly higher than it otherwise would have been.

This explicitly assumes a cause and effect relationship with the thank you causing the 3% tips increase. There could have been several reasons why these waiters got higher tips. They may have been more customer focused and therefore worked harder- and the Thank You might have just been the icing on the cake rather than the cake itself. The point is that there is nothing in the stem that says we can control for the differences in service among the servers. E addresses this dead on IMO.

E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.

E displays this cause and affect and is more than just the result of the study because the evidence of the study doesn’t necessitate that the Thank you’s were the cause of the increased tips. E’s the missing link. B IMO is a booby trap answer. It goes beyond the scope of the claim. Where in the claim is “regular tipping habits” defined or mentioned. Who has the habit? - those in the Thank you group or those who aren’t? I’d argue that both probably have tipping habits. Is B arguing that the Thank you’s would desensitize patrons to the Thank you’s? Even so, That’s a future statement. The actual claim is about what the servers “could have” received so it’s in the past.

Any way these are just my thoughts sometimes I'm wrong. But if B is the answer I can't see it's logic at all. I can see E's.
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 13:13
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 13:42
Well, like I said I don't get it.
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 14:37
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Here's my reasoning for why it's not E. The conclusion is that if waiters write "thank you" on the checks, then they will receive a higher tip. The conclusion is drawn from the fact that in a previous study those who wrote "thank you" received 3% higher tips than those who did not.

According to E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have. This not an assumption that the conclusion depends on. Not all the patrons need to leave more tip than they otherwise would have in order for the conclusion to be drawn that writing "thank you" will increase the tip. The question states ON AVERAGE those who had "thank you" tipped 3% higher. Perhaps only half of the people left a higher tip. Perhaps only a quarter left a higher tip. Or perhaps only one person left a higher tip (a really really big tip). The number of patrons who left a higher tip does not matter in this argument. It's merely stated that ON AVERAGE tips were 3% higher. If the "thank you" induced anyone at all to leave a higher tip then they would have, then the overall tip would be higher.

Vannbj, I understand your reasoning that it's possible that the patrons who got "thank you" on their bill were incidentally the ones who also got better treatment from the waiters. Therefore the better service and not the "thank you" per say was the reason for the higher tip. However, statement E says that virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have. Yes this argument does distinguish that the "thank you" was the cause of the higher tip, but like I mentioned before, it's not necessary for virtually all of the patrons to tip more in order for the conclusion to be drawn.
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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29 Dec 2009, 14:48
Very good point. Touche
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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30 Dec 2009, 05:45
B IT IS.. without doubt
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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02 Jan 2010, 16:29
Thanks for the explanation 11MBA

OA IS B
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Re: GMATprep CR : Pennsylvania waiters [#permalink]

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06 Aug 2011, 07:42
Whys is the OA B and not A when A states that regular patrons will have same impact as occasional , the author assumes that the high income would be generated irrespective of the frequency of occurence of bills.
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Re: In a study conducted in Pennsylvania,Servers in various [#permalink]

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26 Jan 2013, 00:20
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Premise: RANDOM TY NOTE -> INCREASED TIPS
Conclusion: REGULARLY WRITING TY NOTE -> INCREASED TIPS

GAP: RESULT THAT WAS OBSERVED ON "RANDOM" ACTS WILL HAPPEN WHEN THIS IS DONE "REGULARLY"

Which of the following is an assumption on which the argument relies?

A. The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.
No need to assume on the behavior of regular vs occasional patrons... The issue is Random TY Writing vs. Regularly Writing TY Noes..

B. Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
If Regularly doing so will lead to reverting to earlier tipping THEN the conclusion is invalid. This is the assumption.

C. The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
What TY note reminds the customer was not mentioned in the stimulus

D. The rate at which people tip food servers in Pennsylvania Does not vary with how expensive a restaurant is.
We are concerned with average tips collected. The variation is not our concern.

E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.
All patrons is a stretch.

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21 Jul 2013, 21:37
In a study conducted among servers in restaurants in Canada, it was observed that the tips on bills with a "Thank you " note attached were on an average 3 percentage points higher than those without the note. Thus, regularly writing Thank you on the bills will increase the average income from tips significantly.
What is the assumption on which the argument depends.

A) the thank you would have the same effect on regular patrons of the restaurant as on the occasional ones
B) regularly seeing thank you written on the bill will not make the customers change their tipping habits.
C) The thank you reminds restaurant patrons that tips constitute a major part of the income to the servers
D)The rate at which the customers tip does not vary with how expensive the restaurant is
E) Virtually all patrons of the restaurant who were given a bill with a thank you written on it left a larger tip than they would have.

The clear assumption in this question is that the patrons of the restaurant will continue their tipping habits,even after regularly seeing a Thank you written on the bill.

Considering choice A: If the regular patrons contribute towards a larger portion of the revenue earned by the restaurant, the tips that they give will also constitute a significant part of the total income received from tips. In this case, if regular patrons are not affected by the new thank you note, average revenues might not go up significantly- the key word here.

On the other hand, if regular patrons constitute a very small proportion of the customer base, then whether they tip higher or not does not matter at all as far as significant increase in revenues from tips are concerned.

Regular patrons total customers
20 1000 -very small effect
700 1000 -significant effect

So, does the statement as it is stand as a strengthener?

Also, choice A says that the thank you will have the same effect on both regular ones and non regular ones? What effect is this, we do not know. It could mean that both are affected in a way that they tip higher or both are affected in a way that the thank you has no effect. Or are we to assume that the effect being talked about in this option is that they will tip higher?

Suppose we change this statement- " Regular patrons are as likely to tip higher than are occasional patrons"-

Now, we don't know how likely the occasional patrons are to tip. If the likelihood is high- revenues will go up. If not, then revenues will not go up.

What do you think?

Could you suggest possible strengtheners?

Last edited by Zarrolou on 21 Jul 2013, 22:02, edited 1 time in total.
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Re: In a study conducted among servers in restaurants in Canada, [#permalink]

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21 Jul 2013, 22:53
12bhang wrote:
So, does the statement as it is stand as a strengthener?

Also, choice A says that the thank you will have the same effect on both regular ones and non regular ones? What effect is this, we do not know. It could mean that both are affected in a way that they tip higher or both are affected in a way that the thank you has no effect. Or are we to assume that the effect being talked about in this option is that they will tip higher?

Suppose we change this statement- " Regular patrons are as likely to tip higher than are occasional patrons"-

Now, we don't know how likely the occasional patrons are to tip. If the likelihood is high- revenues will go up. If not, then revenues will not go up.

What do you think?

Could you suggest possible strengtheners?

The conclusion uses the word "significantly". Because we do not know the percentages, A as it is NOT a strengthener. It could either increase the income significantly or not, it depends on how many regular/occasional consumers the restaurant has and how much tips they left.

We have to assume that the effect will be higher tips. Because if the same effect were "no effects", then who left the tips?

A strengthener here IMO could be something like:
"All consumers who were given the "thank you" bill left a tip, and came back to the restaurant soon after"
This shows two things:
1)The effect of the bill are predictable and affect all consumers (so the case: "one consumer left a 1000\$ bill, the other none, and the average was 3%" is not a realistic scenario).
2)This procedure does not discourage consumers, because they returned to the restaurant.

Hope this helps
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Re: In a study conducted among servers in restaurants in Canada, [#permalink]

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31 Jul 2013, 00:55
12bhang wrote:
In a study conducted among servers in restaurants in Canada, it was observed that the tips on bills with a "Thank you " note attached were on an average 3 percentage points higher than those without the note. Thus, regularly writing Thank you on the bills will increase the average income from tips significantly.
What is the assumption on which the argument depends.

A) the thank you would have the same effect on regular patrons of the restaurant as on the occasional ones
B) regularly seeing thank you written on the bill will not make the customers change their tipping habits.
C) The thank you reminds restaurant patrons that tips constitute a major part of the income to the servers
D)The rate at which the customers tip does not vary with how expensive the restaurant is
E) Virtually all patrons of the restaurant who were given a bill with a thank you written on it left a larger tip than they would have.

The clear assumption in this question is that the patrons of the restaurant will continue their tipping habits,even after regularly seeing a Thank you written on the bill.

Considering choice A: If the regular patrons contribute towards a larger portion of the revenue earned by the restaurant, the tips that they give will also constitute a significant part of the total income received from tips. In this case, if regular patrons are not affected by the new thank you note, average revenues might not go up significantly- the key word here.

In the context of the passage, "significant" means around 3%. The argument can't sensibly refer to a sample in which tips increased by 3% and say that in the future it will be a 10% increase.
Secondly, we don't know how much of the revenue of the restaurant or tips of the servers are generated from regular patrons or from occassional patrons, so comparing them does not help us any bit. We don't know about any of these and the option statement makes a comparison between these two.

12bhang wrote:
On the other hand, if regular patrons constitute a very small proportion of the customer base, then whether they tip higher or not does not matter at all as far as significant increase in revenues from tips are concerned.

Regular patrons total customers
20 1000 -very small effect
700 1000 -significant effect

So, does the statement as it is stand as a strengthener?

Also, choice A says that the thank you will have the same effect on both regular ones and non regular ones? What effect is this, we do not know. It could mean that both are affected in a way that they tip higher or both are affected in a way that the thank you has no effect. Or are we to assume that the effect being talked about in this option is that they will tip higher?

Suppose we change this statement- " Regular patrons are as likely to tip higher than are occasional patrons"-

Now, we don't know how likely the occasional patrons are to tip. If the likelihood is high- revenues will go up. If not, then revenues will not go up.

What do you think?

Could you suggest possible strengtheners?

Whatever you do with option A, it is going to remain on OFS answer choice till it keeps comparing regular patrons with occasional ones. We don't know about any of these. What would we gain by a comparison of these two? If we had known about tipping habits of one category of guys, then, by comparison, we might have gained something but as is, option A is completely non-nonsensical and out of scope.

Thanks,
Chiranjeev
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Re: In a study conducted among servers in restaurants in Canada, [#permalink]

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02 Aug 2013, 10:18
Please someone explain me the negating technique in assumption questions
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Re: In a study conducted in Pennsylvania,Servers in various [#permalink]

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02 Aug 2013, 11:52

article-what-and-how-to-negate-4-exercise-questions-138510.html

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Re: In a study conducted in Pennsylvania,Servers in various [#permalink]

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07 Aug 2013, 19:22
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zaarathelab wrote:
In a study conducted in Pennsylvania,Servers in various restaurants wrote "Thank you" on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if servers in Pennsylvania Regularly wrote "Thank you" on restaurant bills, their average income from tips would be significantly higher than it otherwise would have been.

Which of the following is an assumption on which the argument relies?

A. The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.

B. Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.

C. The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.

D. The rate at which people tip food servers in Pennsylvania Does not vary with how expensive a restaurant is.

E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.

conclusion:write regularly THANK YOU on restaurant bills ===> income with tip will rise significantly i.e 3 percent (as per the argument)

premise: study conducted on various restaurant ==>bills with thank you earned 3 percent more tips.

A. The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.==.whatever is the effect of patrons whether they are regular or occasional patrons==>end result is that we have received 3 percent more tip which is already proved in premise...==>so this has no effect.

B. Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
now according to premise we gained 3 percent increase on tip having thank you message in an experiment.
that was only in the experiment period.what is different in that experiment period and the conclusion?
the only difference is that time duration==>THE experiment was/must be for some period of time==>in conclusion we are putting THANK YOU message regularly....so thats the only difference if that factor doesnt affect then or conclusion is perfect.hence this is correct

C. The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
we are not concerned what it reminds or not==>if it reminds then it was reminding too during experiment also and viceversa.
so if you negate==>it doesnt remind===>this means experiment was successfull in the absence of reminder...so this one doesnt affects conclusion.

D. The rate at which people tip food servers in Pennsylvania Does not vary with how expensive a restaurant is.
again same as A...we are not concerned how it affects in different types of restaurant ==>end result is we are getting 3 percent increase in tip.
hence out of scope.

E. Virtually all patrons of the Pennsylvania Restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.==>again conclusion doesnt depends on this because whether the increment was because of ALL or because of SOME we are not concerned.

hope this helps
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