To determine the linear relationship between two variables: y and x there may be up to 2 parameters: slope, m and intercept, c.

We show two examples: 

• straight line through the origin, and 

• straight line with intercept 

The value of chi-squared: is calculated in each case with y(x_i) = mx_i [+c]. 

Vary m (and c), by dragging the straight line on the graph, to find the lowest value of C²

How well did you do?

Hit the lower bar to change the type of line being fitted.