Please look at these powerpoints and do your own research with examples and statistics to help with your exam
html code for presentation
https://docs.google.com/present/view?id=dft984dg_4cq6bwxgq&interval=10
https://docs.google.com/present/edit?id=0Ad5MxTh3GnTRZGZ0OTg0ZGdfNGNxNmJ3eGdx&hl=en
===
2 nd ppt
https://docs.google.com/present/edit?id=0Ad5MxTh3GnTRZGZ0OTg0ZGdfNGNxNmJ3eGdx&hl=en
https://docs.google.com/present/view?id=dft984dg_113gjh87ff
===