Question 117448: http://i147.photobucket.com/albums/r317/fizzero/graph.jpg
^that is the link to the graph.
what is the slope and verticle intercept for the line?
m=? and y-intercept=
what is the equation of the line?
using the least square method what is the correlation coefficient?
r= ??
Answer by Fombitz(32388)   (Show Source):
You can put this solution on YOUR website! From your graph, you have 9 (x,y) data pairs.
First, make a table with the x,y data points.
Add 5 columns to your table.
1.
2.
3.
4.
5.
6.
7.
where  is the average of the x values and  is the vaverage of the y values.
Calculate the values for i=1 to 9.
Sum columns 5,6,7.
You are solving for the regression equation
where
or
and
From this we see that
 is the slope of the regression line.
 is the y-intercept of the regression line.
is the equation of the regression line.
To calculate the  , you need to calculate two more quanitities,  and 
where
or
and
or
and
N is the number of data points, 9.
The coefficient, , is then calculated from
EXCEL is the perfect program to do this kind of work.
Good luck.
Post another question if you get stuck.
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