I sat for L1 long ago in December 08 and I’m not very bright, please excuse all the dumb questions I will have. Hopefully they will help others in my situation:

For hypothesis testing, will there be a t critical value chart to reference on the exam? Is it possible for us to come up with t critical on our own?

Also, what are degrees of freedom and how do you know when to use a denominator of n or n-1 or n-2 etc. When I do a regression correlation problem from scratch, I calculate the means of x and y using just n as my denominator. Then when calculating variance and covariance, I must use n-1. And when I do hypothesis testing, I must use n-2. Why?