Please help!!!
What is the difference between the t and z distributions? Why is the t used for smaller samples? Is that just the way it is or is there a reason for it?
THANKS VERY MUCH!!!
Both are theoretical.
A little info wrote {in part}:...
Note: Both the z-distribution and t-distribution are theoretical distributions and therefore both are "exact". They are used to model sampling distributions but are only approximations to any reality.