stats notes

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  • Created by: maddie
  • Created on: 14-05-15 12:00

EXPLORING DATA

Stem and leaf diagrams --> discrete/continuous data 

mean = Σx     grouped data - Σfx
             n                              Σf        

mid range = 1/2(min value + max value)

SxxΣx²- n²  grouped dataΣfx²- n²

Mean Squared Deviation = Sxx          Root mean squared deviationSxx

                                                   n                                                                         n

The Varience  = Sxx                           The standard deviation =   Sxx

                              n-1                                                                            n-1

Outlier: mean ± 2 S.D

Linear coding: Used for very large data --> mean  × ÷ + -  S.D  × ÷

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