Hey everyone, I have a QM exam soon and my teacher did not explain everything that is going to be on the exam which is why I'm having trouble with the notion of "rejection regions". I understand that it's the zone in which the null hypothesis is not probable thus it's the Ha. What I don't get is how we're supposed to get the critical value named Zo. I know I have to do it with the symbol that looks like an a but that's all. My teacher is a huge douche and doesn't really explain anything so I'd really appreciate your help. It's the only thing I don't understand in the whole class.

I'm doing this exact same thing at my college, do you have a huge table full of numbers?

You'll need it if you don't. It saves time and you should get one in the test as well.

Basically if you want the lower region, you find the set of numbers you want on the graph using 'n' (the amount of whatever your using) and 'p' (the probability of it happening). Then you search for the two numbers around the significant percentage, usually around 5% or 10%. (so 0.05 and 0.10). Those are on each side of the lower section for the critical region.

For the upper, you gotta do 1 - the significant percentage, then the two values above whatever you got (don't ask me why).

If you gotta get both ends, then half the significant percentage before doing anything, then do it normally from there.

If this means nothing to you, either I didn't remember it right, or your doing something different that just sounds like what I'm doing. 

hope this helps.

what do you mean for two numbers around the significant percentage? What your saying does make sense but the notes our teacher gave us are terrible. A friend of mine that's doing QM can't even understand his notes -_-

you dont mess with the ZoHa

we need a foget that turns to you with a large grin like "HAH? HAH? GET IT?"

the first number below the percentage and the first number above it.

for instance with 5%, you might see something like 0.4978 and 0.5124.

The numbers they correspond to on the side of the table tell you what the critical region is. The lower one is IN the critical region. the higher one isn't.