Statistics

Statistics

1. Visual Displays of Data

   • Line Graphs
   • Circle Graphs
   • Bar Graphs
   • Stem and leaf
   • Histogram
   • Frecuency Distribution
     • Frecuency
       • Number of times the item ocurred in the data
     • Relative Frecuency
       • Fraction of the data represented by the item
     • Grouped Frecuency Distribution

2. Measures of Central Tendency

   • Weighted Mean
   • Mean
   • Mode
   • Median

3. Measures of Dispersions

   • Standard Deviation
   • Range ( Biggest number - smallest number)
   • Chevyshev's Teorem (1 - 1/k^2)
   • Coefficient of Variation ( v= s/x * 100)

4. Measures of Position

   • Z - score
     • z = (x - mean) / s
   • X - Tiles
     • Percentiles
       • Porcentage under the data I am looking for
     • Deciles
       • It divides the data from 10 to 10
     • Quartiles
       • It divides the data in quartes
   • Box Plot
     • Q1 = Data under the median, Q2 = Median, Q3 = Data above the median