Conducting a paired t-test

Among the number of standard statistical significance test libraries offered by Apache Commons Math, we will be using only a few to demonstrate paired the t-test, Chi-square test, one-way ANOVA test, and the Kolmogorov-Smirnov test. Readers can carry out other significance tests as the codes will use the static methods in the TestUtils class to execute tests.

Apache Commons Math has support for both one-sample and two-sample t-tests. Besides, two sample tests can be either paired or unpaired. The unpaired two-sample tests can be conducted with and without the assumption that the subpopulation variances are equal.

How to do it...

1. Create a method that takes two sets of double values as arguments. We will be conducting a paired t-test to find out any statistical significance between these two sets of values:

           public void getTtest(double[] sample1, double[] sample2){ 
   

2. The t-statistic of the two distributions can be found using the pairedT() method:

           System...