Statistics 2 Help Maths

[megahard]

K, I have an S2 exam tomorrow, and I need some help regarding single nd two tailed tests, i.e. What the hell is one?

I can't remember ever being taught this stuff ever, I just need to understand what it means, cause then maybe the theory will make some sense to me, thanks you

Lee

[Jake Bunce]

I have only taken one statistics course. I forget what two tailed tests are used for, but I remember you need to be careful when picking your Z values. The Z values for a % area under a curve are different for one and two tailed tests.