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Statistics can be used to compare and contrast trends, similarities and differences in data.
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z = (x - mean of x)/ std dev of x I thought this website was pretty good: http://www.jrigol.com/Statistics/TandZStatistics.htm
As the word statistics it's collecting and analyzing data quantities, if we say statistics friendly it's like you are collecting data in a way that it's valuable and uniform, by making a proper decisions in a good manner.
There are a few reasons why samples are used in statistics. One reason is that the whole population cannot be used and a sample is a good representation of the whole.