# creates the differences between the two predictions error$\_$reduced predict $($Sex$\_$model$)-$ predict $($empty$\_$model$)$

# modify this line of code to square and sum these differences error$\_$reducedsquare $($Sex$\_$model$)+$ predict $($empty$\_$model$)$

Ready.

Error in square$($Sex$\_$model$)$: could not find function "square" Traceback: