References
- Coolican , H. (2004) . Research methods and statistics in psychology (4th edition) . London : Hodder & Stoughton . (Chapter 11) .
- Greer , B. and Mulhern , G. 2002 . Making sense of data and statistics in psychology , Basingstoke : Palgrave .
- Hinton , P. R. 1995 . Statistics explained , London : Routledge .