diff --git a/source/index.rst b/source/index.rst
index d359a01..0ac0590 100644
--- a/source/index.rst
+++ b/source/index.rst
@@ -16,7 +16,11 @@ Welcome to ScienceNotes's documentation!
    statistics/bessel_correction
    statistics/bayes_theorem
    statistics/probability_distribution_functions.rst
+   
+   statistics/tests_parametric/index.rst
+   statistics/tests_non_parametric/index.rst
 
+   
 
 
 Indices and tables
diff --git a/source/statistics/tests_non_parametric/index.rst b/source/statistics/tests_non_parametric/index.rst
new file mode 100644
index 0000000..1a000e4
--- /dev/null
+++ b/source/statistics/tests_non_parametric/index.rst
@@ -0,0 +1,7 @@
+Non-Parametric Tests
+--------------------
+
+.. toctree::
+   :maxdepth: 2
+
+
diff --git a/source/statistics/tests_parametric/index.rst b/source/statistics/tests_parametric/index.rst
new file mode 100644
index 0000000..713047f
--- /dev/null
+++ b/source/statistics/tests_parametric/index.rst
@@ -0,0 +1,9 @@
+Parametric Tests
+-----------------
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Statistics
+
+   ttest
+   ztest
diff --git a/source/statistics/tests_parametric/ttest.rst b/source/statistics/tests_parametric/ttest.rst
new file mode 100644
index 0000000..4188f8e
--- /dev/null
+++ b/source/statistics/tests_parametric/ttest.rst
@@ -0,0 +1,2 @@
+T-Test
+-------
diff --git a/source/statistics/tests_parametric/ztest.rst b/source/statistics/tests_parametric/ztest.rst
new file mode 100644
index 0000000..07cce64
--- /dev/null
+++ b/source/statistics/tests_parametric/ztest.rst
@@ -0,0 +1,2 @@
+Z-Test
+-------