My Math Forum Statistics problem - Trend line

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August 2nd, 2011, 07:27 PM   #1
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Statistics problem - Trend line

Hello all,

I have this graph (IN ATTACHMENTS)
NOTE:
x axis - finishing position
y axis - grid position
(Sorry, forgot to mark it in on the graph)

And I've been asked this question 'Given your trend line, what value for this measurement would you expect to need to get at
least a top 3 (podium) finishing position?'

I am having trouble figuring out how to do this. Could anybody help me out or point me in the right direction? Thanks.
Attached Images
 untitled.JPG (46.4 KB, 119 views)

 August 2nd, 2011, 09:02 PM #2 Senior Member   Joined: Apr 2011 From: USA Posts: 782 Thanks: 1 Re: Statistics problem - Trend line Well, I don't know regression analysis, but it seems to me that your top 3 finishing positions are 22 and higher. So wouldn't you just plug 22 in for x in the y = .604x + 4.4426?
 August 2nd, 2011, 09:11 PM #3 Newbie   Joined: Aug 2011 Posts: 3 Thanks: 0 Re: Statistics problem - Trend line Ahhhh, I think you've misunderstood the question. Im' trying to find what grid position one would be in to expect a top 3 finish. For example, the racers who start the race in grid positions 1-5 will expect a top 3 finish.
 August 2nd, 2011, 11:02 PM #4 Senior Member   Joined: Apr 2011 From: USA Posts: 782 Thanks: 1 Re: Statistics problem - Trend line Seems to me that's exactly what I did, except maybe backwards cause I think I took "top" literally - i.e. 3 instead of 22. Is not the point of the line to say where you'd "expect" y to be? And that equation should be the line.

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