I have encountered this sentence in some form or another in several sciences journals-articles or sometimes in the social media bio of random strangers. I get a gut idea of what it is, but I’d like this explained in detailed words, so that I might also be able to explain this to someone, if prompted.
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In fact, if you can only observe an outcome of an experiment and have no knowledge of the internal mechanics of it, then more strict statement is true: **any deterministic behavior is indistinguishable from stochastic behavior**.
Suppose you roll a dice 100 times and every time it yields 6. Is it deterministic? Probably yes, but also it can be an abnormal dice which yields anything else 1 time in 100000 throws. But it is still random. For such a dice this outcome is perfectly normal.
Anyway, in real world all that you get is a probability that in a given experiment we observe a stochastic behavior or a deterministic one. For the above experiment, if you know that the dice is normal, it is still possible that you observe results of a random experiment, but the probability of it is very low.
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