Judicial independence refers to a concept which stated that the courts and judges who interpreted the law must be free from the influence of any other branch of the government.
The purpose of this independence is to ensure that every single human beings in this country are subjected to the same law, nobody can get away with their wrong doings regardless of their status.
This will make the people with high positions in the government become liable for their actions and forcing them to stay in the right path.
Reading a single review of a movie can be informative, but reading a synthesis of many reviews of the same movie can be much more informative about the effect the movie had across many individuals. This notion is analogous to the research strategy known as meta- analysis.