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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: 99.96 on October 01, 2011, 06:23:17 pm

Title: Question from maths quest
Post by: 99.96 on October 01, 2011, 06:23:17 pm

I was having a bit of trouble with this question:
When calculating a least-squares regression line, a correlation coefficient of -1 indicates that:
A) the y-axis variable depends linearly on the x-axis variable
B) the y-axis variable increases as the x-axis variable decreases
C) the y-axis variable decreases as the x-axis variable decreases
D) all the data lie on the same straight line
E) the two variables depend upon each other

I originally had B, but then D looked good as well. The answer says D. Anyone care to explain why it isn't B?

Title: Re: Question from maths quest
Post by: adRo93 on October 01, 2011, 07:19:25 pm

Though it is true, it can also be true for data without a correlation of -1.
I think this question is more of a 'which is the most correct' question. Pretty silly imo!

Title: Re: Question from maths quest
Post by: iroflmfao on October 01, 2011, 07:38:54 pm

Pretty much what he said.

What exam is this btw ? It sounds fun

Title: Re: Question from maths quest
Post by: 99.96 on October 02, 2011, 10:07:04 am

Ah right, fair enough.
Its not an exam, question out of a book