It says if the value of n is large we may use normal approximation in place of t distribution i.e. N(0,1) in place of t_n. For what value of n can we approximate a t distribution to N(0,1)? It says for large n I want to know how large n should be?
What values of n is t_n tabulated in the Tables? So what would the appropriate thing to do in an exam if it's larger than the tabulated values?
