Sampling

• Sample types

  Random

  Volunteer

  Opportunity

  Systematic

  Stratified
• What is random sampling

  Picking names at random from a hat or a name generator
• Strengths of random

  -Reduced researcher bias

  -More representative
• Weakness of random

  Time consuming
• What is opportunity sampling

  Using the people who are available/ around at the time
• Strength of opportunity

  quick, easy and cheap
• Negative of opportunity

  Not representative
• What is volunteer sampling

  people who put themselves forward (in an advert for example)
• Strength of volunteer

  Quick, easy and cheap
• Weakness of volunteer

  Unrepresentative
• What is systematic sampling

  Choosing every nth person
• Strength of systematic

  Reduced researcher bias
• Weakness of systematic

  Unrepresentative
• What is stratified sampling

  Creating subcategories
• Strength of stratified

  Most representative
• Weakness of stratified

  -Time consuming

  -Difficult