Why do I have not equal SST calculated by two different ways?

Why the result obtained by SStotal=∑(Yi−Y^i)2+∑(Y^i−Y¯)2  (the last column in attached Libre Office doc) doesn't equal to SStotal=∑(Yi−Y¯)2 ( column is marked as red) ?

08 August 2017 7,843 2 View