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Answer
There is no single best method to collect statistical data simply because of one single constant factor in this everchanging world which is TIME changes everything from your respondents, geological inputs economic factors social groups and current technology especially true if you are collecting data based on Human Activities.
Step-by-step explanation:
Take for example, any researched Project ever been done or will be doing in the Future. The definitions alone of Project according to Oxford English Dictionary, states that a Project is a temporary endeavor to satisfy current needs fulfill requirements or simply solve a problem and collecting Data whatever method using whether it is survey, experiment, obsevation or any combination of those methods can never stay valid because of TIME. Statistics and Time doesnt have Forever. Statistics looses its value as time goes by, like, if you are collecting data say; semi-conductor; in the nineteen ninetees production costs shrink by one half every six months. Significantly cutting prices of Electronic every six months, because of advancement in Technology enable manufacturers to cut production costs by reducing its size yet double its capacity hence, reducing raw materials and production time thus reducing its costs even further, so the based data of Six months in the ninetees is not applicable today. Did you know that the first Production PC * running in just 256 mega hertz which have the same processing capacity as the latest I7 Laptop made by Lenovo which is 50,000x faster than the 256 PC only costs 20,000php, hopes I explained it well, THANKS.