I have a PhD in psychology and am a full time professor. I have taught statistics courses using SPSS for over 20 years at both undergraduate and graduate levels and supervised a number of master's thesis and doctoral dissertations. Also, I have worked as a data analysis/research design consultants for many federal/local grant projects. At the same time, I have worked with college students who just started learning statistics. I, however, do not consider myself a statistician. I am an expert u...