secondary data source on which you rely on what other people have already published about the topic at hand.
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Statistics plays a vital role in every fields of human activity. Statistics has important role in determining the existing position of per capita income, unemployment, population growth rate, housing, schooling medical facilities etc. in a country. Now statistics holds a central position in almost every field like Industry, Commerce, Trade, Physics, Chemistry, Economics, Mathematics, Biology, Botany, Psychology, Astronomy etc., so application of statistics is very wide.
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.
The statistics (pl.) indicate that statistics (sing.) is a pseudo-science.
The two main forms of statistics are qualitative (descriptive) statistics and quantitative (inferential or inductive) statistics.