Techniques for Random Sampling and Bias Avoidance

Why is it important to use random sampling in surveys?

• To ensure the survey is easy to conduct

• To save time and resources

• To avoid bias and get a representative sample

• To make the survey more interesting

What is a simple random sample?

• A sample where every individual has an equal chance of being selected

• A sample where only volunteers are selected

• A sample where individuals are selected based on convenience

• A sample where individuals are selected based on their grades

What is a potential issue with simple random sampling?

• It is too complicated to implement

• It might not represent all subgroups equally

• It can be too expensive

• It always introduces bias

How does stratified sampling ensure better representation?

• By selecting individuals based on their convenience

• By dividing the population into subgroups and sampling from each subgroup

• By allowing individuals to volunteer for the survey

• By using a random number generator

In stratified sampling, what is a 'stratum'?

• A subgroup within the population

• A random number generator

• A type of bias

• A survey question

What is the main advantage of clustered sampling?

• It ensures balanced representation of subgroups

• It avoids all types of bias

• It is easier to conduct

• It is less expensive

In clustered sampling, what is a 'cluster'?

• A survey question

• A group of individuals with similar characteristics

• A random number generator

• A type of bias

What is a voluntary sample?

• A sample where individuals are selected based on their convenience

• A sample where individuals volunteer to participate

• A sample where individuals are selected randomly

• A sample where individuals are selected based on their grades

Why can a voluntary sample introduce bias?

• Because only certain types of individuals may choose to participate

• Because it is too complicated to implement

• Because it is too expensive

• Because it always uses a random number generator

How can the wording of a survey question introduce bias?

• By allowing individuals to volunteer

• By using a random number generator

• By making the survey too long

• By influencing the respondent's answer