Relevant
Statistic
Conditions
Relevant
Distribution
Equation
Variances of
2 populations
Population is
normally
distributed
F-distribution
Means of 2
populations
Two samples are
dependent
Student-t
Means of 2
populations
Either
is known,
or n1 and n2
exceed 30
Standard
normal
Means of 2
populations
n1 and n2 less
than 30, accept
Student-t
Means of 2
populations
n1 and n2 less
than 30, reject
Student-t
