Statistics : T-Distribution and Z-Distribution

A. What is the difference in appearance between a t-distribution and a z-distribution? Why do they have slightly different appearances?

b. When do we use a t-distribution rather than a z-distribution?

Solution Summary

The difference between a T-Distribution and Z-Distribution is discussed. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.