CrazCo Posted February 7, 2008 Share Posted February 7, 2008 How do I find the correlation and regression for this linear graph. X: 0 , 100 , 200 , 300 , 400 , 500 , 600 , 700 , 800 , 900 , 1000 Y: 20 , 19 , 18 , 18 , 17 , 16.5 , 16 , 15 , 14.5 , 13.7 , 13 The ones lined up are the coordinates. Anyone can guide me as to how to find the answer? Link to comment Share on other sites More sharing options...
ydoaPs Posted February 7, 2008 Share Posted February 7, 2008 Take two of the points and find the rate of change(m) by the equation [math]m=\frac{{y_1}-{y_2}}{{x_1}-{x_2}}[/math]. Then plug m, an x value and the corresponding y value into the equation y=mx+b and solve for b. Then you have m and b and it should be ridiculously obvious how to get the equation from there. Link to comment Share on other sites More sharing options...
CrazCo Posted February 7, 2008 Author Share Posted February 7, 2008 Hmm maybe we weren't suppose to find the equation then.. we were told to use and TI 84 Plus and that seems too easy Link to comment Share on other sites More sharing options...
NeonBlack Posted February 7, 2008 Share Posted February 7, 2008 Since not all of the points fall on the same line, they probably want you to use your calculator to do a best fit. I'm unfamiliar with the 84+ so I'm afraid I can't help you any more than that. See if you can find the documentation on the TI website and search it for 'best fit' Link to comment Share on other sites More sharing options...
CrazCo Posted February 7, 2008 Author Share Posted February 7, 2008 English is my second language so I don't really know what you mean by best fit? like "mieux ajustée?" oops i guess we have to find the correlation and regression.. Link to comment Share on other sites More sharing options...
NeonBlack Posted February 7, 2008 Share Posted February 7, 2008 I don't have much mathematics vocabulary in French, so I don't know what you call it, but yes "regression" is essentially the same as best fit. Link to comment Share on other sites More sharing options...
CrazCo Posted February 7, 2008 Author Share Posted February 7, 2008 I got y = -0.0067x+19.78 19.78 was rounded btw.. i dont know if its right though :S thanks for the help Neon! Link to comment Share on other sites More sharing options...
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