diff --git a/source/ch-4-Confidence-Intervals.ptx b/source/ch-Confidence-Intervals.ptx
similarity index 84%
rename from source/ch-4-Confidence-Intervals.ptx
rename to source/ch-Confidence-Intervals.ptx
index c279be4..7e42a6f 100644
--- a/source/ch-4-Confidence-Intervals.ptx
+++ b/source/ch-Confidence-Intervals.ptx
@@ -8,6 +8,6 @@
   </introduction>
 
   <!-- include sections -->
-  <!-- <xi:include href="sec-section-name.ptx" /> -->
+  <xi:include href="sec-Central-Limit-Theorem.ptx" />
 
 </chapter>
\ No newline at end of file
diff --git a/source/ch-3-Expected-Value.ptx b/source/ch-Expected-Value.ptx
similarity index 84%
rename from source/ch-3-Expected-Value.ptx
rename to source/ch-Expected-Value.ptx
index 2ac3035..b4ef3c9 100644
--- a/source/ch-3-Expected-Value.ptx
+++ b/source/ch-Expected-Value.ptx
@@ -8,6 +8,6 @@
   </introduction>
 
   <!-- include sections -->
-  <!-- <xi:include href="sec-section-name.ptx" /> -->
+  <xi:include href="sec-Expected-Value.ptx" />
 
 </chapter>
\ No newline at end of file
diff --git a/source/ch-5-Hypothesis-Testing.ptx b/source/ch-Hypothesis-Testing.ptx
similarity index 83%
rename from source/ch-5-Hypothesis-Testing.ptx
rename to source/ch-Hypothesis-Testing.ptx
index eda79b0..0ee3bde 100644
--- a/source/ch-5-Hypothesis-Testing.ptx
+++ b/source/ch-Hypothesis-Testing.ptx
@@ -8,6 +8,6 @@
   </introduction>
 
   <!-- include sections -->
-  <!-- <xi:include href="sec-section-name.ptx" /> -->
+  <xi:include href="sec-One-Sample-Tests.ptx" />
 
 </chapter>
\ No newline at end of file
diff --git a/source/ch-6-Linear-Regression.ptx b/source/ch-Linear-Regression.ptx
similarity index 83%
rename from source/ch-6-Linear-Regression.ptx
rename to source/ch-Linear-Regression.ptx
index 6c65cd9..b558236 100644
--- a/source/ch-6-Linear-Regression.ptx
+++ b/source/ch-Linear-Regression.ptx
@@ -8,6 +8,6 @@
   </introduction>
 
   <!-- include sections -->
-  <!-- <xi:include href="sec-section-name.ptx" /> -->
+  <xi:include href="sec-Covariance.ptx" />
 
 </chapter>
\ No newline at end of file
diff --git a/source/ch-1-Probability.ptx b/source/ch-Probability.ptx
similarity index 85%
rename from source/ch-1-Probability.ptx
rename to source/ch-Probability.ptx
index 97dc575..8841607 100644
--- a/source/ch-1-Probability.ptx
+++ b/source/ch-Probability.ptx
@@ -8,6 +8,6 @@
   </introduction>
 
   <!-- include sections -->
-  <xi:include href="sec-section-name.ptx" />
+  <xi:include href="sec-Set-Theory.ptx" />
 
 </chapter>
\ No newline at end of file
diff --git a/source/ch-2-Random-Variables.ptx b/source/ch-Random-Variables.ptx
similarity index 82%
rename from source/ch-2-Random-Variables.ptx
rename to source/ch-Random-Variables.ptx
index 276a919..c914dee 100644
--- a/source/ch-2-Random-Variables.ptx
+++ b/source/ch-Random-Variables.ptx
@@ -8,6 +8,6 @@
   </introduction>
 
   <!-- include sections -->
-  <!-- <xi:include href="sec-section-name.ptx" /> -->
+  <xi:include href="sec-Discrete-Random-Variables.ptx" />
 
 </chapter>
\ No newline at end of file
diff --git a/source/main.ptx b/source/main.ptx
index 912b183..b34a162 100644
--- a/source/main.ptx
+++ b/source/main.ptx
@@ -11,12 +11,12 @@
     <xi:include href="./frontmatter.ptx" />
 
     <!-- Include chapters -->
-    <xi:include href="./ch-1-Probability.ptx" />
-    <xi:include href="./ch-2-Random-Variables.ptx" />
-    <xi:include href="./ch-3-Expected-Value.ptx" />
-    <xi:include href="./ch-4-Confidence-Intervals.ptx" />
-    <xi:include href="./ch-5-Hypothesis-Testing.ptx" />
-    <xi:include href="./ch-6-Linear-Regression.ptx" />
+    <xi:include href="./ch-Probability.ptx" />
+    <xi:include href="./ch-Random-Variables.ptx" />
+    <xi:include href="./ch-Expected-Value.ptx" />
+    <xi:include href="./ch-Confidence-Intervals.ptx" />
+    <xi:include href="./ch-Hypothesis-Testing.ptx" />
+    <xi:include href="./ch-Linear-Regression.ptx" />
 
 
     <!-- Include backmatter -->
diff --git a/source/sec-Central-Limit-Theorem.ptx b/source/sec-Central-Limit-Theorem.ptx
new file mode 100644
index 0000000..9eabd75
--- /dev/null
+++ b/source/sec-Central-Limit-Theorem.ptx
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<section xml:id="sec-Central-Limit-Theorem" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <title>Section Title</title>
+
+  <p> Text of section. </p>
+
+</section>
\ No newline at end of file
diff --git a/source/sec-section-name.ptx b/source/sec-Covariance.ptx
similarity index 58%
rename from source/sec-section-name.ptx
rename to source/sec-Covariance.ptx
index 924b3fe..e085378 100644
--- a/source/sec-section-name.ptx
+++ b/source/sec-Covariance.ptx
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<section xml:id="sec-section-name" xmlns:xi="http://www.w3.org/2001/XInclude">
+<section xml:id="sec-Covariance" xmlns:xi="http://www.w3.org/2001/XInclude">
   <title>Section Title</title>
 
   <p> Text of section. </p>
diff --git a/source/sec-Discrete-Random-Variables.ptx b/source/sec-Discrete-Random-Variables.ptx
new file mode 100644
index 0000000..f19c27a
--- /dev/null
+++ b/source/sec-Discrete-Random-Variables.ptx
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<section xml:id="sec-Discrete-Random-Variables" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <title>Section Title</title>
+
+  <p> Text of section. </p>
+
+</section>
\ No newline at end of file
diff --git a/source/sec-Expected-Value.ptx b/source/sec-Expected-Value.ptx
new file mode 100644
index 0000000..ac71333
--- /dev/null
+++ b/source/sec-Expected-Value.ptx
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<section xml:id="sec-Expected-Value" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <title>Section Title</title>
+
+  <p> Text of section. </p>
+
+</section>
\ No newline at end of file
diff --git a/source/sec-One-Sample-Tests.ptx b/source/sec-One-Sample-Tests.ptx
new file mode 100644
index 0000000..3c49541
--- /dev/null
+++ b/source/sec-One-Sample-Tests.ptx
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<section xml:id="sec-One-Sample-Tests" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <title>Section Title</title>
+
+  <p> Text of section. </p>
+
+</section>
\ No newline at end of file
diff --git a/source/sec-Set-Theory.ptx b/source/sec-Set-Theory.ptx
new file mode 100644
index 0000000..2c641f3
--- /dev/null
+++ b/source/sec-Set-Theory.ptx
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<section xml:id="sec-Set-Theory" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <title>Section Title</title>
+
+  <p> Text of section. </p>
+
+</section>
\ No newline at end of file