 በመጀመሪያዎቹ ሁለት ነጥቦች ዙሪያ ያደረግነው ውይይት በዚህ ተቋጨ ወደ ሚቀጥሉት ነጥቦች ስንሔድ፡-
We reduce the two samples to one by working with the differences between the paired observations, as in the following layout for two treatments