*y = a+bx <- the line of y on x*

*Residuals are the distance between the point on the graph and the line of best fit.*

*Formula for regression is*

(y - y(bar)) = (Sxy)/(Sxx) x (x - x̅ )* *

*To plot this on a graph, (*x̅,y(bar)) *lies on the regression line, *

*When using x you need to work out **ŷ (just use a calculator**) *

*To find the equation for a and b,*

- Put numbers off table in calculator, mode , stat, *a+bx, reg, a (write value down) then do b*

*To predict*

*- AC either x or y = .. shift, stat, reg,* *x(hat)/y(hat)*

*Extrapolation = a prediction outside the set of data is unreliable (interpolation is the opposite).*

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