character that does not change from the beginning of the story.
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That is the definition of a statistic
A descriptive statistic describes the characteristics of a known set of data; such as mean, median, mode, range, standard deviation and so forth.
The definition of statistics is the science of conducting studies to collect, organize, summarize, analyze and draw conclusions from data.
No The test statistic F-Test is a sum of squares, which by definition of squaring a number it must be positive.
Yes, but it rather pointless. The mean deviation for any data set will, by definition, be 0. Grouping may make it slightly different from 0 but this statistic has little, if any, useful properties.