Paper 3

• What is an advantage and disadvantage of stratified sampling?


  Advantage: Gives a good comparison of different areas eq. upper, middle and lower.

  Disadvantage: Not suitable for something like a questionnaire.
• What is an advantage and disadvantage of systematic sampling?


  Advantage: Easier to do than random sampling

  Disadvantage: Can be time consuming
• What is an advantage and disadvantage of random sampling?

  Advantage: Not bias - each site has an equal chance of being picked.

  Disadvantage: Site can get clustered together meaning data isn't representative.
• What hazard does unfamiliar areas have?

  Getting lost in new environments
• What hazards does weather have?

  Wet weather is dangerous due to slippery groynes etc.

  Hot weather also poses the risk of dehydration
• What hazard does uneven ground have?

  Danger of falling overdue to uneven footpaths
• What hazards does river currents have?

  Risk of powerful water and risk of slipping over
• What are the 3 types of sampling?

  Random sampling

  Systematic sampling

  Stratified sampling
• What does reliable conclusions mean?

  When there is enough data collected in an accurate way so we can trust the results
• What are the 2 types of data measured by?

  Quantitative data - Statistical/ numbers

  Qualitative data - Descriptive / words
• What does accurate conclusions mean?

  Data collected in the correct way that makes what we find to be trustworthy
• What are the 2 types of data?

  Primary data - Collected yourself

  Secondary data - Collected by others