basic statistics




   variables
   statistical tables
   description by graph
   distribution
   indexes
   mean
   median
   mode
   the location of the mean , median , mode in the different distributions
   range
   variance and standard deviation
   absolute average deviation
   coefficient of variation cv
   percentile
   Standard Scores
   linear transformation of indexes
   using formulas that contain relative frequency (p) instead of frequency (f)
   combined mean
   combined variance






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