I'm suspecting that there are students of linguistics reading this blog, as well as graduated linguistics and non-academic language enthusiastic. Well, if you are a linguist and want to learn statistics you might want to check out this book that is available for free online. I love me some freely available good stuff, and even though this is an old work it's still a very good introduction. You should be reading newer literature too, but if you're just looking to get started this is an easy way to get moving. I actually used this book more than the literature I bought and payed for during my introduction to linguistics. It does not have the most recent and updated methods, but many things are still valid and relevant.