I am stuck on how to work through these problems.

1) Find the probability associated with a z score of 1.20.

2) Find the probability associated with a z score of 2.25.

3) Find the z score associated with a probability of .2912.

4) Find the z score associated with a probability of .0062.

5) Find a t-score using a two-tailed test, an alpha level of .05, and ten degrees of freedom.

6) Find a t-score using a one-tailed test, an alpha level of .01, and fifteen degrees of freedom.

7) Why are t-scores larger with fewer degrees of freedom and smaller with more degrees of freedom?

8) 1) Find the probability associated with a z-score of 1.96. 2) Find t scores using a two-tailed test, a .05 alpha level, and an infinite degree of freedom. What is the important relationship between the first and second probabilities you just found?