stats

• Types of Data


  • Primary
  • Secondary
• Advantages of Primary Data

  • Accurate
  • Collection method known
  • Can find answers to specific questions
• Disadvantages of Primary Data

  • Time consuming
  • Expensive
  • Method of collection unknown
• Types of Primary Data

  • Quantitative
  • Qualitative
• Types of Quantitative Data

  • Continuous
  • Discrete
• Advantages of Secondary Data

  • Quick
  • Dete from some organisations can be collected yourself
  • More reliable than primary data
• Disadvantages of Secondary Data

  • Deta may be out of date
  • May contain mistakes
  • May come from unreliable source
  • May be difficult to find answers to specific questions
• Types of Secondary Data

  • Categorical
  • Ordinal
  • Bivariate
  • Multivariate
• Advantages of Census


  • Unbiased
  • Accurate
  • Takes into account entire population
• Disadvantages of Census


  • Time consuming
  • Expensive
  • Lots of data to manage
  • Difficult to ensure whole population is used
• Advantages of Sample


  • Cheaper
  • Quicker
  • Less data to consider
• Disadvantages of Sample


  • May be biased
  • Not completely representative
• Types of Sampling


  • Biased Sampling
  • Systematic Sampling
• Systematic Sampling


  To find nth interval = Population size / Sample size
• Types of Experiments


  • Laboratory Experiment
  • Field Experiment