Day 10 Objectives
     
      Understand Basic Descriptive 
     Statistics
     Frequencies
      
       Frequency Distributions
      
       How to construct a frequency distribution table
     Proportions & Rates
     Central Tendency
      
       Mean
      
       Median
      
       Mode
     Variability
      
       Range
      
       Standard Deviation
      
       Variance
  Descriptive 
  Statistics
  are methods of organizing, summarizing, and 
  presenting data in a convenient and informative 
  way. These methods include:
   Numerical Techniques 
   Graphical Techniques
  The actual method used depends on what 
  information we would like to extract. 
  Descriptive Statistics helps to answer these 
  questions…
    Descriptive Statistics
    1) Produce numbers that describe a set of data 
    2) Common types of descriptive stats – these 
      are forms of Summarizing Data 
       
       Frequencies 
       
       Proportions and Rates 
       
       Central tendency 
       
       Variability 
    Frequencies
  Simply Tallying and Counting the amount of times an event occurs. 
  Frequencies can be ungrouped or grouped
  How many scores, observations, items or people fall within an 
  interval.
  E.g. How many children in each age-group in a school?
  1. 5 – 7 years of age = 15
  2.8 – 10 years of age = 16
  3.11 – 13 years of age = 13
   The Frequency 
   Distribution Table
   
  The data in original form in which they are 
  collected are called raw data. They need to be 
  organized in such a way that is easily 
  comprehensible. 
   
  A good way is to organize them by constructing 
  a frequency distribution. The following 
  examples will illustrate you the frequency 
  distributions.