For
example, if 85% of Americans in the north are
online and 77% of Americans in the south are
online is that difference real or the result
of random chance?
To
determine if the difference is significant follow
these steps:
Plug
in the sample size for each of the independent
groups.
Plug
in the proportions that you wish to test.
Select
a confidence level.
Click
on Calculate.
Note:
this procedure can be validly employed only
if both samples satisfy the standard binomial
requierement that n*p and n(1-p) must both be
equal to or greater than 5, where n=samples
size and p=percentage.
