Psych students, please help! :)

[yearningforsimplicity]

For Psych (Mind, Brain and behaviour 1), we need a textbook called "Statistics for the Behavioural Sciences" (9th edition) - The problem is my friend's already given me this book but it's the 8th edition one Should I just keep it or would there be a big difference between the two editions??

Thanks in advance!

[mankay]

You definitely don't need it at all for MBB1 and won't be disadvantaged even remotely for not using it.