diff --git a/education/statistics/Hypothesis Tests.md b/education/statistics/Hypothesis Tests.md
index 0c84c0f..12d96b4 100644
--- a/education/statistics/Hypothesis Tests.md	
+++ b/education/statistics/Hypothesis Tests.md	
@@ -4,4 +4,5 @@ This test can be used if:
 - The sample size is large
 - A qualitative variable of interest summarized by percentages
 - Can use a box with tickets of 1s and zeros to represent the population
+If an observed value is too many SEs away from the expected value, it is hard to explain by chance.
 ## c tests for averages