Chi Squared Tests (Edexcel A-Level Further Mathematics): Quizzes

$y$ depends on $x$

Squares of vertical distances

Predicting outside the data range

Data is linearly correlated

$b = \frac{S_{xy}}{S_{xx}}$

$a = \bar{y} - b\bar{x}$

Increase in $y$ per unit increase in $x$

Yes, within data range

No, outside data range

The control variable