Posted by ggift on Friday, September 11, 2009 at 6:58am.
If y= k x + b, a linear relationship, lets increment it a bit.
changeiny= k*changeinX
Notice no matter what values x and y have, the changes are related by k.
Take the above data. Notice the first increment of x, 5 to 10, A change of 5. The change in y is 10 (20 to 30). The ratios of y/x is 2 (10/5). That ratio is x.Now try other places in the data.
Look at the end, x goes from 25 to 30, a change of 5. But y does not change (50 to 50). We would have expeced a change ratio of 2, or 2*5=10 if it were linear.
So the data is not a linear relationship.
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