I think they supplement each other. Wikipedia is a great place to go explanatory material; statistics are a part of that but if you are really interested in the numbers behind something you'll probably follow up the citations. Alpha looks to have great potential as a tool for statistical discovery and analysis, but I rather doubt it auto-generate tutorials on what data mean or why they matter.
It would be nice if Wikipedia can improve the quality of its articles by linking to Alpha; I hope Wolfram research won't exert a propriety attitude to its search results, but will make them available with something like a creative commons license to the extent that the original sources are in the public domain.
It would be nice if Wikipedia can improve the quality of its articles by linking to Alpha; I hope Wolfram research won't exert a propriety attitude to its search results, but will make them available with something like a creative commons license to the extent that the original sources are in the public domain.