This calculator will perform a 2 X 2 chi-square test. This is a simple but very useful way to
decide if two variables with two levels each are related to each other. For instance, suppose you asked 100 men
and 100 women whether they voted Democrat or Republican in the last
election. You find that 52/100 men
voted Democrat and 60/100 women voted Democrat. It looks as if women are more likely to
have voted Democrat -- but is the difference strong enough to be
reliable? In other words, if you were
able to sample everyone who voted, would you expect to still find that a
higher percentage of women had voted Democrat? This calculator will tell you.
For our example, looking at political party by gender, you would make the
entries shown below. Your first
variable is "gender" with two levels, "male" and
"female". Your second
variable is "political party" with Democrat and Repuplican. Now click "NEXT" at the bottom of
the page and enter your own data.