What is this saying?

myfriendtoldmeimkeen
Posts: 10
Joined: Tue Dec 30, 2008 10:26 pm

What is this saying?

Postby myfriendtoldmeimkeen » Thu Feb 04, 2010 5:41 pm

Ecosystems with cool, dry climates are populated by large animals. No ecosystems populated by large animals have abundant and varied plant life.


How would you diagram this?

holborn
Posts: 347
Joined: Mon Oct 19, 2009 3:27 pm

Re: What is this saying?

Postby holborn » Thu Feb 04, 2010 5:46 pm

I would use if/then statements.

if ecosystem w/ cool, dry climate --> large animals
if ecosystem w/ large animals --> no abundant and varied plant life

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holydonkey
Posts: 1184
Joined: Fri Dec 18, 2009 1:40 pm

Re: What is this saying?

Postby holydonkey » Thu Feb 04, 2010 5:49 pm

myfriendtoldmeimkeen wrote:Ecosystems with cool, dry climates are populated by large animals. No ecosystems populated by large animals have abundant and varied plant life.


How would you diagram this?


All E = L
No L = A

Thus, No E = A or No A = E

?

E = Ecosystems with cool, dry climates
L = populated by large animals
A = have abundant and varied plant life

joekim1
Posts: 47
Joined: Wed Jul 01, 2009 7:20 am

Re: What is this saying?

Postby joekim1 » Thu Feb 04, 2010 6:52 pm

holydonkey wrote:
myfriendtoldmeimkeen wrote:Ecosystems with cool, dry climates are populated by large animals. No ecosystems populated by large animals have abundant and varied plant life.


How would you diagram this?


All E = L
No L = A

Thus, No E = A or No A = E

?

E = Ecosystems with cool, dry climates
L = populated by large animals
A = have abundant and varied plant life


wouldn't it be

E -> L
L -> ~A
∴ E -> ~A

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dbrddr
Posts: 287
Joined: Sun Oct 18, 2009 8:24 pm

Re: What is this saying?

Postby dbrddr » Thu Feb 04, 2010 8:17 pm

I suggest you stop worrying about how to diagram the stimulus and instead zone in on the obvious inferences, in full sentence form:

-No ecosystem with cool, dry climates has abundant and varied plant life.

OR

-Any ecosystem with abundant and varied plant life does not have a cool, dry climate.


Don't make things harder than they are. You've got to be able to make these sorts of deductions mentally within just a few seconds. It just takes a little practice.




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