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A Regression Analysis Example, continued

Since all the points lie on a straight line, we can find the exact relationship using the formula for a straight line:

To find the slope, calculate the change in y per unit change in x:

In this case, calculate the quotient of the change in y and the change in x, from point 1 to point 2:

This means that when x increases by 1, y increases by 0.002.