Sampling

• What is random sampling?


  Population is picked randomly, with all having an equal chance of being picked.
• What is a key advantage of random sampling?

  It provides an unbiased representative sample.
• What is a disadvantage of random sampling?


  It is inefficient and often time-wasting.
• What is stratified sampling?


  It involves splitting the target population into important subcategories in correct proportions.
• What is a key advantage of stratified sampling?


  It is representative and should generalize well due to ordered subcategories.
• What are the disadvantages of stratified sampling?


  It is hard to identify important characteristics and is time-consuming.
• What is opportunity sampling?


  It involves selecting people who are available at the time.
• What is a key advantage of opportunity sampling?


  It is quick and economical since participants are readily available.
• What is a disadvantage of opportunity sampling?


  It is unrepresentative and biased, often favoring more educated individuals.
• What is volunteer sampling?


  It involves individuals who have willingly volunteered, often from an advertisement.
• What is a key advantage of volunteer sampling?


  It is convenient as little effort is required for advertisements.
• What is a disadvantage of volunteer sampling?

  Volunteers tend to be more outgoing and may not represent the general population.
• What is systematic sampling?


  A sample is obtained by selecting every nth person from a list.
• What is a key advantage of systematic sampling?


  It is unbiased as participants are selected using an objective system.
• What is a disadvantage of systematic sampling?


  It is not totally random unless the selection number is chosen randomly.