The use of numbers which have been prepared and audited and then must be published by sendingthem to others.
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The FBI compiles these figures after gathering natinonwide statistics, and the published statistics usually run 1 to 2 years behind. The 2011 statistics have not yet been compiled.
secondary data source on which you rely on what other people have already published about the topic at hand.
Never? Avoid thinking in absolutes. It is much better to understand published statistics but impossible to say "never safe to ...".
There are two types of statistics. One is called descriptive statistics and the other is inferential statistics. Descriptive statistics is when you use numbers. Inferential statistics is when you draw conclusions or make predictions.
Psychological statistics is the application of statistics to psychology.