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.
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The importance of statistics in sociology are that they give a person tangible evidence to support theories. This evidence is then used to spot trends and predict the social development of many populated areas.
Inferential statistics uses data from a small group to make generalizations or inferences about a larger group of people. Inferential statistics should be used with "inferences".
Statistics are a crucial part of the field of medicine. Health statistics provide information about studies which help to track the progress of research and development of new cures and technology. In addition, health statistics give a good glimpse of the overall health of the human race, showing which diseases are prevalent in different locations, as well as how the quality of health varies by location, age, and other factors.
In Finance, people learn statistics so that they can be able to carry out essential financial calculations such as trend predictions. Statistical calculations can let people make forecasts using current figures.
To show statistics, it was first used by Florence Nightingale to show the British government the statistics of the amount of hospital patients dying unnecessarily