The word 'science' is not an English term. It has a greek/latin origin 'scire"
Scire = to know
Any method to know is a scientific method.
If you use a microscope to know about a bacterium, then it is a scientific method.
If you statistics to know about the mean value taken by a variable, then it is a scientific method.
By the way, are you asking the commercialised meaning of the word 'science'.
In the commercial world, the word 'science' takes a very different meaing which no true scientist can tell you.