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Why do scientists use two different models of light?
To distinguish results based on the only two variables of awareness. Observed (presence) vs the unobserved (absence) changes the outcome in every experiment. Something like a control group, if i am on the right side of the road (as in 50 states, but not territories of the US that is us.
How many variables may be tested legitimately in any one experiment?
I think it's very difficult to answer this question simply. Depending on the sophistication of your research model and the amount of data and the accuracy with which the research is carried out, you can test several variables simultaneously. This can be done 'legitimately', and sometimes it is too costly to run research projects that test one or two variables at a time. Some of these complex and sophisticated statistical models are used very infrequently, but it can be done.
Three kinds of models used in science?
mathematical models conceptual models and Physical models
Is anything from models fake?
Not necessarily. Models for faith, models for morals and conduct, and models for leadership are, for examples, not fake.
What are the three major types of explanatory models?
regression models econometric models leading indicators
