From 2ebf7832f871871fc1d84c3c8aed16e0c53402c3 Mon Sep 17 00:00:00 2001
From: Evgenii Balai <iensen2@mail.ru>
Date: Thu, 30 Mar 2017 14:58:16 -0500
Subject: [PATCH] typo: redundant "and"

---
 manuscript/09_ht.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/manuscript/09_ht.md b/manuscript/09_ht.md
index 2aefb60..7bb33ff 100644
--- a/manuscript/09_ht.md
+++ b/manuscript/09_ht.md
@@ -291,7 +291,7 @@ Consider now testing {$$}H_0 : \mu_1 = \mu_2{/$$}. Our statistic is
 \frac{\bar X_1 - \bar X_2 - (\mu_1 - \mu_0)}{S_p\sqrt{\frac{1}{n1} + \frac{1}{n_2}}}.
 {/$$}
 
-For the equal variance case and and
+For the equal variance case and
 
 {$$}
 \frac{\bar X_1 - \bar X_2 - (\mu_1 - \mu_0)}{\sqrt{\frac{S_1^2}{n1} + \frac{S_2^2}{n_2}}}.