Math 4th Quarter Exam Reviewer

• Discrete variables


  Variables that consist of indivisible categories (e.g. class size)
• Continuous variables


  Variables that are infinitely divisible into whatever units a researcher may choose (e.g. time, weight)
• Discrete variables


  • Class size
• Continuous variables


  • Time
  • Weight
• Time can be measured to the nearest minute, half second, etc.
• Summation Notation 

  Sigma

  • sum of the values of the variable

  Example ;

  n

  (sigma)   xi

  i = 1 

  if x1 = 8, x2 = 10, x3 = 12, x4 = 15, x5 = 20

  5

  (sigma)  x1     = x1 + x2 + x3 + x4 + x5 

  i = 1                 = 8 + 10 + 12 + 15 + 20

                          = 65

  Example ; (Multiplication)

  5

  (sigma)  7

  i = 1

  = 5 (7) = 35
• Data


  Collection of facts or information
• Primary Data


  • Coming from primary sources such as government agencies, business institutions, organizations, or any person who possesses original data relevant to the given problem
• Secondary Data


  • Obtained from secondary sources such as journals, magazines, newspapers, any republished materials
• Data collection methods


  • Conducting Surveys
  • Observing the outcomes of events
  • Taking measurements in any experiment
  • Reading statistic publication
• Survey methods


  • Interview method
  • Questionnaire method
• Data collection methods


  • Observation method
  • Experimental method
• Data presentation forms


  • Textual Form
  • Tabular Form
• Organizing & Presenting Data


  Structuring and displaying data in a clear and meaningful way