In statistics, cases are comprised of the data that is being studies. The cases in statistics can be updated frequently as the data changes.
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* There are no correct statistics and that's why it's called 'cheating' (no one knows in many cases who is cheating on who.) However, the guesstimate statistics are high and getting worse every year.
The two main branches of statistics is Descriptive statistics and inferential statistics.
I can not give you a simple answer. It is very individual and subjective. I will assume that you are referring to probability theory. Statistics is based on an understanding of probability theory. Many professions require basic understanding of statistics. So, in these cases, it is important. Probability theory goes beyond mathematics. It involves logic and reasoning abilities. Marketing and politics have one thing in common, biased statistics. I believe since you are exposed to so many statistics, a basic understanding of this area allows more critical thinking. The book "How to lie with statistics" is a classic and still in print. So, while many people would probably say that probability theory has little importance in their lives, perhaps in some cases if they knew more, it would have more importance.
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