Elementary Statistical Methods
           Chapter 2
      Frequency Distributions and 
            Graphs
          Slides are made by 
           Tamer Oraby
            UTRGV
                  Outline:
    1. Summarizing variables in frequency tables and relative 
     frequency tables.
    2. Some graphical representation for variables: quantitative and 
     qualitative.
                     2.1 Organizing Data
                                     Organizing Data
            Qualitative                                           Quantitative
        Tables            Graphs                 Discrete                            Continuous
    - Frequency        - Bar graph
    (F)                                    Tables         Graphs            Tables               Graphs
                       - Pie chart                       -
    - Relative                          - F & RF                         - F & RF           - Histogram F & 
    frequency                                            Histogram                          RF
    (RF)                                                 F & RF
                                                         -Dot plot                          - Polygon F and RF
                                                                                            - Ogive
                                                                                            - Stem-and-leaf
                                                                                            - Box plot (next 
                                                                                            chapter)
            Definition: Frequency distribution table shows 
            data values and the number of times they occur.
            Frequency is the count of times an item 
            appears
             
            Relative frequency =              which is like a probability
   Qualitative variables