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        Session 2 Sources of data
  Main contents:
  1. Types of data
  2. Secondary data
  3. Sampling methods
  2.1 Types of data
  Data can be classified as follows:
  (a)Primary and secondary data
  Primary data – are data collected especially for a specific purpose.
  Secondary data – are data which have been collected elsewhere, for some
  other purposes, but which can be used or adapted for the
  survey being conducted.
  (b)Discrete and continuous data
  Discrete data – are data which can only be taken on a finite or countable
  number of values within a given range.
  Continuous data – are data which can take on any value.
  (c )Sample and population data
  Sample data – are data arising as a result of investigating a sample
  Population data – are data arising as a result of investigating the population..