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Math Help - Graphing large data values?

  1. #1
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    Graphing large data values?

    Not sure if I posted in the right area but here's my situation: I have x values ranging from 900-1000 (and I want to break it up in 10s, so 900, 910, 920, etc. as I need to show the relationship between the two variables) and y values ranging from 1500 to 1600. First I have to do a scatter plot of the points (there's 16 points), and on the same graph I have to do a linear line (regression line) and show the y-intercept of this line.

    My problem is is that I'm unsure of how I should go about this. I don't want to have to write out all the values that I don't need on the axes as my points would then look bunched up and I won't be able to comment on the relationship between the two variables. I've considered using broken axes, but I'm not sure whether I can use it with linear graphs as it seems that it may make the graph appear misleading.

    It would be good if someone could also provide a picture of how I should go about this.


    EDIT;
    so I did a quick sketch on paint. If I did it like this, would it be right? Is it okay to start at 0 on the x axis but not on the y-axis?
    Graphing large data values?-untitled.png
    Last edited by tutto00; April 28th 2012 at 11:07 PM.
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  2. #2
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    Re: Graphing large data values?

    You can technically start end the axies where you want, but getting the intercept in this manner will not work as there is a gap in the axis. If I were you I'd use the graph to get the gradient then put into y=mx+c for known x and y, then rearrange to get c.
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  3. #3
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    Re: Graphing large data values?

    I've found the equation already, so in the graph, I don't show the y-intercept? And just put the equation next to it?
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