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Tennis racket strings often go "dead" – become less responsive and

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Tennis racket strings often go "dead" – become less responsive and  [#permalink]

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New post 30 Dec 2017, 21:43
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Tennis racket strings often go "dead" – become less responsive and shock absorbent – after a few weeks of intense use. A researcher whose son is a professional tennis player hypothesized that dirt and sweat, rather than changes in the material properties of the string, were responsible.

Which of the following investigations is most likely to yield significant information that would help to evaluate the researcher's hypothesis?

A. Determining if a synthetic fiber is used to make the strings used by tennis pros.
B. Determining whether doubles players make their strings go dead faster than do singles players.
C. Determining whether identical lengths of string, of the same type, go dead at different rates when strung on various brands of rackets.
D. Determining whether a dead string and a new string strike the ball in different ways.
E. Determining whether smearing various substances on new tennis strings causes them to go dead.

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Re: Tennis racket strings often go "dead" – become less responsive and  [#permalink]

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New post 06 Jan 2018, 13:23
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Tennis racket strings often go "dead" – become less responsive and shock absorbent – after a few weeks of intense use. A researcher whose son is a professional tennis player hypothesized that dirt and sweat, rather than changes in the material properties of the string, were responsible.

Which of the following investigations is most likely to yield significant information that would help to evaluate the researcher's hypothesis?

A. Determining if a synthetic fiber is used to make the strings used by tennis pros. -We need to find whether dirt and sweat are responsible for the changes. We already know material used to make the strings is not responsible for dead strings.
B. Determining whether doubles players make their strings go dead faster than do singles players. -Out of scope
C. Determining whether identical lengths of string, of the same type, go dead at different rates when strung on various brands of rackets. -Out of scope
D. Determining whether a dead string and a new string strike the ball in different ways. -Out of scope
E. Determining whether smearing various substances on new tennis strings causes them to go dead. -Correct. If dirt and sweat make a string dead then it strengthens the argument, else it weakens the argument.
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Re: Tennis racket strings often go "dead" – become less responsive and  [#permalink]

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New post 09 Jan 2018, 10:56
Mmmm I know that comes from Kaplan but I am not very satisfied with the OA.
"Various substances" can mean everything, even sulphuric acid! That is not comparable with the sweat and dirt found in a tennis court.
The answer B for me is the best one: a racket of a double tennis player is exposed to the same level of dirt and sweat but not the same level of stress because the two players "switch", and so comparing the strings would be very effective!
Tell me if you agree with my toughts :-)
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Re: Tennis racket strings often go "dead" – become less responsive and  [#permalink]

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New post 10 Jan 2018, 18:10
MvArrow wrote:
Mmmm I know that comes from Kaplan but I am not very satisfied with the OA.
"Various substances" can mean everything, even sulphuric acid! That is not comparable with the sweat and dirt found in a tennis court.on
The answer B for me is the best one: a racket of a double tennis player is exposed to the same level of dirt and sweat but not the same level of stress because the two players "switch", and so comparing the strings would be very effective!
Tell me if you agree with my toughts :-)

IMO

Option E will provide you most significant information to prove/disprove the stem. Option B will add too many other variables before we make any conclusion.
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Tennis racket strings often go "dead" – become less responsive and  [#permalink]

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New post 10 Jan 2018, 20:06
MvArrow wrote:
Mmmm I know that comes from Kaplan but I am not very satisfied with the OA.
"Various substances" can mean everything, even sulphuric acid! That is not comparable with the sweat and dirt found in a tennis court.
The answer B for me is the best one: a racket of a double tennis player is exposed to the same level of dirt and sweat but not the same level of stress because the two players "switch", and so comparing the strings would be very effective!
Tell me if you agree with my toughts :-)


I too have had the same reasoning for B. But later, after rereading the premise I noticed that the comparison is between the dirt level and properties of the string, not the intensity. In B the two rackets can reasonably be assumed to be comprising identical strings and hence, identical properties.

Premise: Tennis racket strings often go "dead" – become less responsive and shock absorbent – after a few weeks of intense use. A researcher whose son is a professional tennis player hypothesized that dirt and sweat, rather than changes in the material properties of the string, were responsible.

B is exploiting the orange part, where as we need to focus on the green part.E presents a striking evidence of dirt keeping the properties same.

Hope this helps.
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Tennis racket strings often go "dead" – become less responsive and &nbs [#permalink] 10 Jan 2018, 20:06
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