Chi sqaure test

[newto]

Hi,
I want to do Chi-square test, to find the weather two distribution are same or not.

I want to use some statistical function to do that.
i found common math library to that test.

But I don't know how to use that library.
Math - Commons-Math: The Apache Commons Mathematics Library

and I find the code as

long[] observed = {10, 9, 11};
double[] expected = {10.1, 9.8, 10.3};
System.out.println(TestUtils.chiSquare(expected, observed));


If anyone can give me the idea about how to sue it, that will be very helpful for me.

Thank you

[Norm]

What happens when you execute your program?
If the answer is wrong, can you explain what it should be?

[curmudgeon]

To calculate the chi-squared value for simple data, you don't need any special library. All you have to do is to apply the formula for the calculation to the data:
http://en.wikipedia.org/wiki/Chi-square_statistic

Now to get a p value from the chi-square result and your degree of freedoms, you'll need to use a look-up table or some external library.