Hello, I've recently returned to education after a 15 year hiatus to tackle a PhD that includes data analysis. There are various classes I can take at uni but I always feel I'm missing some fundamentals, and quite honestly the quality of 'teaching' is variable plus I doubt they ever came across anyone of my calibre (as in utterly useless). I never did maths a level (did intermediate paper GCSE) and I'd like to try and catch up now.
Can anyone recommend a set of books (has to be books, I cannot learn online) that has exercises, practice questions and worked answers please? Obviously i don't mind if it's current syllabus or which exam board but there needs to be a heavy statistics focus because that's the part I really need. I'm not daft so I think I can do this, it's just an unfortunate glaring hole in my education. We have a support group at uni so I can get occasional tutoring if I get stuck.
Any advice on some books to get to guide me through would be most appreciated. Bonus if they are slightly outdated and available cheaply second hand. Thanks!