Let's just clear this up. Take my advice.
I did a lot of research on this because I am in the same boat. I got both Stat. and Calc AP credits, but also took 1 semester of a Calc class in college (no stats class at all). Some of the schools I am applying to require 1 year of math and may or may not not accept AP credits. So what do I do?
Here is what I suggest, to be on the safe side. List the class you are missing as a "Future course" at a nearby Extension school (Ex: UCLA extension, Harvard Extension, etc.). The schools you will apply to have varying requirements for much of this stuf and you dont want to have to take the class if you dont absolutely need to. So, when you are further on in your application (and in time to sign up for the class), you can see what kinds of responses you are getting from schools. If you get rejected from all of the schools that required the class, you can just leave things alone. If you are still in the running for one of the schools that requires the class, you can contact individual schools and get more personal; ask them what they advise. If things roll a certain way, you will have to sign up for the class and take it.
Doing it this way is great because you don't have to contact the 10-20 schools that you will apply to, you can simply list the class required as a future class. I just looked up the required class that was available at UCLA extension and listed that (including course number and such) and then filled it out as a "future course." There is usually no application or anything for the extension school courses, so it is a guaranteed slot.
I hope that this helps,
Best,
C