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Major Concept Quiz

PostPosted: Thu Jan 26, 2012 11:46 am
by beniakc
Question 7
Is it not cause and effect becuase there is no conclusion? Dave addresses why its wrong, but I dont understand (maybe I misssed it).

Also, since this is a positive correlation, what would a negative correlation look like?

Re: Major Concept Quiz

PostPosted: Thu Jan 26, 2012 12:19 pm
by beniakc
Could I also get a better break down of 22. I see why it is grouping but not why it can not be linear.

Re: Major Concept Quiz

PostPosted: Thu Jan 26, 2012 2:18 pm
by Steve Stein
beniakc wrote:Question 7
Is it not cause and effect becuase there is no conclusion? Dave addresses why its wrong, but I dont understand (maybe I misssed it).

Also, since this is a positive correlation, what would a negative correlation look like?


In that example, the gambler has noticed that in the past, when he's driven to Reno, he has won, and when he has flown to Reno he has lost every time.

This relationship reflects a positive correlation between driving to Reno and winning money. That is, those two factors have tended to move together; when he has driven he has tended to win, and when he has won he has tended to have driven. That does not mean, however, that driving caused him to win (since gambling generally deals with some degree of chance, it seems rather unlikely that driving caused his wins).

A negative correlation exists between the gamblers driving experiences and his losing experiences: when he has driven he has tended not to lose, and when he has lost he has tended not to have driven.

Let me know whether this clears things up--causation vs. correlation can be tricky.

~Steve

Re: Major Concept Quiz

PostPosted: Thu Jan 26, 2012 3:16 pm
by beniakc
Should'nt that question reflect both a positive and negative correlation then?

Re: Major Concept Quiz

PostPosted: Thu Jan 26, 2012 3:36 pm
by Steve Stein
Since the question that you referenced specifically asks about the relationship between driving to Reno and winning money, the answer deals only with a positive correlation.

Let me know whether this clears things up--thanks,

~Steve

Re: Major Concept Quiz

PostPosted: Thu Jan 26, 2012 3:40 pm
by beniakc
ahhhhh damn!! Now I see it. Reading to fast!! ugggg