cause and effect
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If the observer and the observing equipment are unbiased then there is no reason for the study to be biased.
There are a number of ways, but I would just use an observational study.
Descriptive research includes observational methods, case study methods, and survey methods. They are used to describe situations instead of make predictions about them.
Probably not. I would challenge anyone to prove that with a scientific study.
Observations and measurements recorded during an experiment are called results. These results can help to make a conclusion or theory or become the object of further study.