Statistics is what is used to confirm a hypothesis or theory. It can be numerical, nominal, and is calculated as data is tabulated mostly through the use of spread-sheet in an SPSSS program . and so long as you punch the numbers into the calculator it will come up excellent, this is why it is so much fun to go to this class, unless you have no money to pay for it.
at first statistics is fun it explains the names of categories of the numbers, it tells you why statistics is important even- just like I am telling you right now, useful, how to purpose research methods that are GRANT worthy, convince people with NUMBERS, that is how the world works.
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It is the population which you are studying.
There are very many things in life where the outcome is uncertain. Studying statistics gives you the tools to make sense of the information, validate the information and helps you to make rational decisions based on statistics.
The answer depends on your aptitude and the level at which you are studying them.
It is a characteristic that is being studied which is different for different members of the population. The characteristic need not be numeric and the population need not be people - for example, you could be studying the colour of cars.
At a guess exponentials, series and statistics would have been important in studying micro-organisms.