http://trochim.human.cornell.edu/tutorial/hussain/Page1.htm This Internet site provides information about the posttest-only control-group design as well as the design and results of an actual experiment that uses this design. I recommend that you read the information included in all the links in this Internet site starting with the “best buy” link and then continuing with the “theory” and “validity” links and ending with the “shoppers advantage” link.
http://trochim.human.cornell.edu/kb/expfact2.htm This internet site will give you additional exposure to factorial designs as well as viewing and interpreting main effects and interactions. I highly recommend that you spend some time with this site.
