Homework Soursetdistribution with n1 n2 1 degrees of freedom tdistributio
t-distribution with n1 + n2 - 1 degrees of freedom
t-distribution with n1 + n2 degrees of freedom
t-distribution with n1 + n2 - 2 degrees of freedom
normal distribution
| a | t-distribution with n1 + n2 - 1 degrees of freedom | |
| b | t-distribution with n1 + n2 degrees of freedom | |
| c | t-distribution with n1 + n2 - 2 degrees of freedom | |
| d | normal distribution |
Solution
if sample > 30, the sampling distribution is approximated by a normal distribution
