This is the best attempt at introducing some basic statistical concepts and methods that I have seen. It is very good in parts, has errors in parts and is mediocre in parts. I have tried to identify some of my concerns above. It would probably be best being used alongside a course to illustrate some of the concepts. I do not think that it can stand alone as an introduction though it is improving.
Correlation is dealt with nicely.
At various places support is offered for SPSS and SAS statistical packages. At times the package moves too quickly and makes assumptions about the user. There are computational and factual errors. I know that this is not the main aim of the package, but there is much useful infor mation which it would be nice to access more directly. It is often difficult to remember where one has been.