Updated: October 21, 2020
H_0 (subscript 0)
The position that there is no relationship among two measured phenomenon or among groups. The central task of science is to prove that a relationship may exist between entities, implying that the null hypothesis is false.
Thus, centrally, science attempts to disprove the null hypothesis for a given field of questioning. This hypothesis is the default stance when approaching a statistical/scientific problem; i.e. the null hypothesis begins as true and it is up to the investigator to prove otherwise.