YouTube can definitely be a valid source depending on the channel and what you're looking for. For instance, many companies and organizations do use YouTube to make announcements and various other videos. In fact, the U.S. Governement also has a YouTube account, which would probably mean that YouTube has at least a couple of credible sources.
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A source is considered valid if it has these qualities: 1. It is not any type of forum 2. Answers cannot be modified by the public 3. It is not a personal website A lot of people look at Wikipedia, YahooAnswers, and even this site as invalid sources.
I'm not sure what you're asking here. Are you talking about validity?.. And if the measurements you have provided are valid?.. Or Reliability.. If the measurements you have gotten are reliable as you can check them with another source and you get the same answer?
No, the scientific method can be uncontrolled to for it to be valid.
a valid investigation is an effective investigation i think. The results turn out to be what you had inferred.
No, YouTube never has been, nor is today a scamming website.