Preptest 28 sec. 3 #21

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ltowns1
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Joined: Mon May 26, 2014 1:13 am

Preptest 28 sec. 3 #21

Postby ltowns1 » Mon Apr 06, 2015 12:42 pm

I had (B) on this. My inclination was to diagram the statement like this

Jenny lots of Ballons--->> Birthday party

No balloons

Therefore, no birthday party

Can someone explain why the conditional is the other way around???? Thanks

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Christine (MLSAT)
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Re: Preptest 28 sec. 3 #21

Postby Christine (MLSAT) » Mon Apr 06, 2015 4:50 pm

Hey Itowns1!

The first sentence of (B) tells us that Jenny will have lots of balloons at her birthday party. There's nothing that suggests that she's not allowed to have lots of balloons other times also! Maybe she has lots of balloons every Saturday, but also at her birthday party! So, balloons aren't a guarantee of anything - it could be any random day, not just birthday party day.

But if I KNOW she'll have balloons at her party, then her party is sufficient information to guarantee that there are lots of balloons there.

It's just like if I said that I'll have pizza tonight. That's not "pizza --> tonight" - maybe I have pizza all the time! It's "tonight --> pizza".

(As a side note, notice that the conditional in (B) is about her birthday party, while the conclusion is about whether it is actually her birthday. People have birthday parties on days other than their actual birthday all the time, so we have a scope shift here that should be an additional red flag.)

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ltowns1
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Re: Preptest 28 sec. 3 #21

Postby ltowns1 » Mon Apr 06, 2015 7:36 pm

Christine (MLSAT) wrote:Hey Itowns1!

The first sentence of (B) tells us that Jenny will have lots of balloons at her birthday party. There's nothing that suggests that she's not allowed to have lots of balloons other times also! Maybe she has lots of balloons every Saturday, but also at her birthday party! So, balloons aren't a guarantee of anything - it could be any random day, not just birthday party day.

But if I KNOW she'll have balloons at her party, then her party is sufficient information to guarantee that there are lots of balloons there.

It's just like if I said that I'll have pizza tonight. That's not "pizza --> tonight" - maybe I have pizza all the time! It's "tonight --> pizza".

(As a side note, notice that the conditional in (B) is about her birthday party, while the conclusion is about whether it is actually her birthday. People have birthday parties on days other than their actual birthday all the time, so we have a scope shift here that should be an additional red flag.)




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