I took DSST Stats on October 3rd. I studied for approximately one month. I used the Idiots Guide to Statistics. I knew I was ready after going through the entire book. It really prepares you.
You can also look back through the message boards. I posted exactly what was on my version of the exam. If you do not undertsand what I am saying in that post, then perhaps you need more time. It is really up to you.
Good luck!!
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