Conducting a Chi-square test

For conducting a Chi-square test on two sets of data distributions, one distribution will be called the observed distribution and the other distribution will be called the expected distribution.

How to do it...

1. Create a method that takes these two distributions as arguments. Note that the observed distribution is a long array, while the expected distribution is a double array:

           public void getChiSquare(long[] observed, double[] expected){ 
   

2. Get the t-statistic of the Chi-square test as follows:

           System.out.println(TestUtils.chiSquare(expected, observed)); 
   

3. The p-value of the test can found in a similar way but with a different method:

           System.out.println(TestUtils.chiSquareTest(expected, 
             observed)); 
   

4. We can also observe whether the difference between the expected and observed data distributions is significant for a given confidence interval, as follows:

           System.out.println(TestUtils.chiSquareTest(expected, observed...