I am running a standard multiple regression for my dissertation but I am finding some of the output difficult to understand when it comes to checking if the assumptions for a multiple regression have been violated. I have never seen a scatterplot like the one below and do not know what it means for my assumptions or how to remedy it, no text book covers this either. Any advice for any of the outputs below would be much appreciated. If there is any information I can provide please let me know and I will do so.