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A parcel delivery company calculated that nearly

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A parcel delivery company calculated that nearly [#permalink]

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New post 22 Feb 2018, 04:42
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  5% (low)

Question Stats:

84% (01:14) correct 16% (01:20) wrong based on 108 sessions

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A parcel delivery company calculated that nearly 10% of its drivers’ time was spent waiting to make left turns across busy traffic. During that time, the engines on the drivers’ trucks were idling, wasting fuel while not advancing the vehicle or delivering packages. In an effort to reduce labor costs by making drivers’ time more efficient, the company recalculated its routes to involve only right-hand turns. Over the subsequent year, the company saw its fuel costs decrease by over 10%, a savings that its operations team attributes to the route recalculation.

Which of the following, if true, would most weaken the operations team’s assertion that the fuel savings can be attributed to route recalculation?

A)Some drivers’ routes were several miles longer after the route recalculation than before it.
B)The cost of a gallon of fuel dropped by nearly 20% in the year after the route recalculation.
C)The route recalculation led to a significant reduction in the number of accidents caused by the company’s vehicles.
D)The fuel savings over the first year were largely offset by the cost to train drivers to handle their new routes.
E)During the first month of the new routes, the average mileage per route increased as drivers missed stops and had to circle around to return to the route.

[Reveal] Spoiler:
Official Solution: The argument in this Weaken stimulus is one of correlation vs. causation: two things are known to have happened together (the route recalculation and the savings in fuel cost) but that is not necessarily enough to conclude that one caused the other.

In correlation/causation Weaken questions, the right answer is often an alternative explanation for the cause. Essentially "yes events X and Y happened together, but X didn't cause Y...Z is the thing that caused Y." Here you see that with answer choice B: the route recalculation didn't cause the fuel savings, but instead the price of fuel just dropped on it own causing the fuel savings. Choice B is correct.

Choices A and E are wrong for similar reasons: they show that in some cases the route recalculation may have led to more fuel being used, but you don't know that these cases are the majority (and in E you know that it was certainly a minority of occasions). Choice C is irrelevant, missing the scope of the conclusion which is only about the reason for the fuel savings. And choice D is similarly irrelevant - it mentions the fuel savings, but doesn't deal with the cause.
[Reveal] Spoiler: OA

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Re: A parcel delivery company calculated that nearly [#permalink]

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New post 23 Feb 2018, 12:23
NandishSS wrote:
A parcel delivery company calculated that nearly 10% of its drivers’ time was spent waiting to make left turns across busy traffic. During that time, the engines on the drivers’ trucks were idling, wasting fuel while not advancing the vehicle or delivering packages. In an effort to reduce labor costs by making drivers’ time more efficient, the company recalculated its routes to involve only right-hand turns. Over the subsequent year, the company saw its fuel costs decrease by over 10%, a savings that its operations team attributes to the route recalculation.

Which of the following, if true, would most weaken the operations team’s assertion that the fuel savings can be attributed to route recalculation?

A)Some drivers’ routes were several miles longer after the route recalculation than before it.
B)The cost of a gallon of fuel dropped by nearly 20% in the year after the route recalculation.
C)The route recalculation led to a significant reduction in the number of accidents caused by the company’s vehicles.
D)The fuel savings over the first year were largely offset by the cost to train drivers to handle their new routes.
E)During the first month of the new routes, the average mileage per route increased as drivers missed stops and had to circle around to return to the route.



To weaken the conclusion we need to pick the option that shows the saving in fuel cost is not because of route recalculation but because of something else

(B) states the same. If the price of fuel has dropped with or w/o route recalculation the savings would have occured

(B) imo
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Re: A parcel delivery company calculated that nearly [#permalink]

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New post 27 Feb 2018, 00:20
NandishSS wrote:
A parcel delivery company calculated that nearly 10% of its drivers’ time was spent waiting to make left turns across busy traffic. During that time, the engines on the drivers’ trucks were idling, wasting fuel while not advancing the vehicle or delivering packages. In an effort to reduce labor costs by making drivers’ time more efficient, the company recalculated its routes to involve only right-hand turns. Over the subsequent year, the company saw its fuel costs decrease by over 10%, a savings that its operations team attributes to the route recalculation.

Which of the following, if true, would most weaken the operations team’s assertion that the fuel savings can be attributed to route recalculation?

A)Some drivers’ routes were several miles longer after the route recalculation than before it.
B)The cost of a gallon of fuel dropped by nearly 20% in the year after the route recalculation.
C)The route recalculation led to a significant reduction in the number of accidents caused by the company’s vehicles.
D)The fuel savings over the first year were largely offset by the cost to train drivers to handle their new routes.
E)During the first month of the new routes, the average mileage per route increased as drivers missed stops and had to circle around to return to the route.

[Reveal] Spoiler:
Official Solution: The argument in this Weaken stimulus is one of correlation vs. causation: two things are known to have happened together (the route recalculation and the savings in fuel cost) but that is not necessarily enough to conclude that one caused the other.

In correlation/causation Weaken questions, the right answer is often an alternative explanation for the cause. Essentially "yes events X and Y happened together, but X didn't cause Y...Z is the thing that caused Y." Here you see that with answer choice B: the route recalculation didn't cause the fuel savings, but instead the price of fuel just dropped on it own causing the fuel savings. Choice B is correct.

Choices A and E are wrong for similar reasons: they show that in some cases the route recalculation may have led to more fuel being used, but you don't know that these cases are the majority (and in E you know that it was certainly a minority of occasions). Choice C is irrelevant, missing the scope of the conclusion which is only about the reason for the fuel savings. And choice D is similarly irrelevant - it mentions the fuel savings, but doesn't deal with the cause.

YES B IS the answer as this will weaken the argument and other are out of scope or doesn't explain 10% saving while waste for 10 min fuel.
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Re: A parcel delivery company calculated that nearly [#permalink]

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New post 24 Mar 2018, 18:56
NandishSS wrote:
A parcel delivery company calculated that nearly 10% of its drivers’ time was spent waiting to make left turns across busy traffic. During that time, the engines on the drivers’ trucks were idling, wasting fuel while not advancing the vehicle or delivering packages. In an effort to reduce labor costs by making drivers’ time more efficient, the company recalculated its routes to involve only right-hand turns. Over the subsequent year, the company saw its fuel costs decrease by over 10%, a savings that its operations team attributes to the route recalculation.

Which of the following, if true, would most weaken the operations team’s assertion that the fuel savings can be attributed to route recalculation?

A)Some drivers’ routes were several miles longer after the route recalculation than before it.
B)The cost of a gallon of fuel dropped by nearly 20% in the year after the route recalculation.
C)The route recalculation led to a significant reduction in the number of accidents caused by the company’s vehicles.
D)The fuel savings over the first year were largely offset by the cost to train drivers to handle their new routes.
E)During the first month of the new routes, the average mileage per route increased as drivers missed stops and had to circle around to return to the route.

[Reveal] Spoiler:
Official Solution: The argument in this Weaken stimulus is one of correlation vs. causation: two things are known to have happened together (the route recalculation and the savings in fuel cost) but that is not necessarily enough to conclude that one caused the other.

In correlation/causation Weaken questions, the right answer is often an alternative explanation for the cause. Essentially "yes events X and Y happened together, but X didn't cause Y...Z is the thing that caused Y." Here you see that with answer choice B: the route recalculation didn't cause the fuel savings, but instead the price of fuel just dropped on it own causing the fuel savings. Choice B is correct.

Choices A and E are wrong for similar reasons: they show that in some cases the route recalculation may have led to more fuel being used, but you don't know that these cases are the majority (and in E you know that it was certainly a minority of occasions). Choice C is irrelevant, missing the scope of the conclusion which is only about the reason for the fuel savings. And choice D is similarly irrelevant - it mentions the fuel savings, but doesn't deal with the cause.


A)Some drivers’ routes were several miles longer after the route recalculation than before it.

B)The cost of a gallon of fuel dropped by nearly 20% in the year after the route recalculation.

C)The route recalculation led to a significant reduction in the number of accidents caused by the company’s vehicles.

D)The fuel savings over the first year were largely offset by the cost to train drivers to handle their new routes.

E)During the first month of the new routes, the average mileage per route increased as drivers missed stops and had to circle around to return to the route.

We need an alternate reason to prove that saving done last year was not due to route recalculation, but some other reason was there.

(B) says the same
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Re: A parcel delivery company calculated that nearly   [#permalink] 24 Mar 2018, 18:56
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