It is that it cannot be reliable.
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is not applicable to the qualitative phenomena
Never? Avoid thinking in absolutes. It is much better to understand published statistics but impossible to say "never safe to ...".
Your question is confusing, "Can you have some crime statistics?" I don't really understand the question, but if I assume you're asking where you can get statistics on crimes in the United States, one of the places is the Federal Bureau of Investigation. Also, if you type into your browser window "crime statistics" there are other websites where you can go to do your research.
Well statisticians are those that study statistics. Usually they are some kind of scientist because they make observations and experiments. Or they are mathematicians... For some of the people who have contributed to the development of statistics over the years - see related link.
Not necessarily. Inferential statistics are statistics which are used in making inferences about some distribution. The only requirement is that they are based only on the set of observed values.