So I asked every kid there. They are all madly turning wrenches changing the carbs out and blathering banter. Not a one of them in the whole class the whole time had the foggiest idea how a car works! They were all monkeys with a hammer trying to fix a helicopter. Including the teacher!
So when I got a motorcycle and needed to tune it up I got a manual and learned myself. Two years later with a 240Z pulled the engine tore it down took it to a machine shop put it back together and it started on the first turn of the key, just fired up like it had never been taken apart. Even the timing was only very slightly off, because I had set it by eye very close which I was able to do because by this point I understand very well exactly what I am doing, how every single little bit of it works. All the stuff no one else was able to tell me about even in a class where that is supposed to be all they do.
If you want to learn this stuff the odds of running into someone like me who really does understand and can actually explain it are slim to none.
What that means is if you utter the words "double blind" in anything other than mockery and derision then YOU are the ape trying to fix the helicopter with a hammer. YOU need to drop the BS step away from the keyboard go out and DO and HEAR and LEARN- on your own.
I know it is scary having to actually do something. Yes it is a whole lot easier to jabber away on a keyboard pretending to know. But you know what? We can all clearly see that you do NOT know, because otherwise you would never utter the words double-blind in anything other than mockery and derision.