STATISTICAL MEASURES Diana Arias

STATISTICAL MEASURES Diana Arias

1. TREND CENTRAL

   • THEY ARE DIVIDED INTO
     • DATA GROUPED
       • FASHION
         • Its symbol is Mo. the represents the interval that has older frequency in the data group
       • HALF
         • We must consider a representative value of each interval we call class mark and that all quantities of the absolute frequency are represented by that value
       • MEDIAN
         • It is the value up to which accumulated 50% of the data
           • Where: Li: is the lower limit of the median or mode, fi: is the absolute frequency of the interval of the median or mode and fi-1: is the absolute frequency accumulated prior to the interval of the median or mode and A is the width of the interval
     • DATA NOT GROUPED
       • HALF
         • is obtained by dividing the sum of all data between the frequency total which we call average
       • MEDIAN
         • We need to sort the data from smallest to largest and then we take the value that is in the group center
       • FASHION
         • It is the value that most is repeated
   • summarizes the information by medium of numbers

2. DISPERSION

   • Tells us if a variable moves more than another
   • THE BEST KNOWN ARE
     • RANGE
       • It is the difference between the maximum value and the minimum of one sample statistics
     • VARIANCE
       • It represents the variability of the data about the mean
     • DEVIATION STANDARD OR TYPICAL
       • It is the dispersion of the data from the mean. It is obtained by taking the square root of the variance
     • COEFFICIENT OF VARIATION
       • It is obtained by dividing the standard deviation between the absolute value of the mean and is expressed as a percentage

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