Value of Sampling

• What is often impossible when studying a group?

  Studying every individual in the group
• What is a sample in research?

  A small portion representing the entire group
• How do researchers use samples in studies?

  To estimate characteristics of the larger population
• What are the benefits of using samples in research?

  • Makes studying large populations feasible
  • Reduces time and resource expenditure
  • Allows for estimation of population characteristics
• What is stratified random sampling also known as?

  Proportional random sampling
• What is the main purpose of stratified random sampling?

  To divide the population into homogenous groups
• How does stratified random sampling differ from simple random sampling?

  It divides the population into strata before sampling
• What are the key features of stratified random sampling?

  • Divides population into homogenous groups (strata)
  • Ensures representation of different strata in the sample
  • Increases precision of estimates
• What does quota sampling choose based on?

  A group of people with certain characteristics
• Why is random sampling often more expensive than quota sampling?

  It requires a large group of people to be sampled
• How does quota sampling compare to random sampling in terms of respondents needed?

  Quota sampling requires fewer respondents
• What is a respondent in market research?

  A person who takes part in research
• What are the key differences between quota sampling and random sampling?

  • Quota sampling selects based on specific characteristics.
  • Random sampling involves selecting a large, random group.
  • Quota sampling requires fewer respondents than random sampling.
  • Random sampling is often more expensive.
• What methods can be used to choose samples from a population?

  Random number table or generator
• What does it mean for each member of the population to have an equal chance of being selected?

  Each member has an equal, independent chance
• How does the use of a random number table or generator affect sample selection?

  It ensures equal and independent selection chances