Front

What is a controlled experiment?

Back

A controlled experiment is a scientific test where the observational units are assigned randomly to different treatments, allowing for the determination of cause and effect relationships between variables.

Front

What is a cluster sample?

Back

A cluster sample is a sampling method where the population is divided into groups (clusters), and entire clusters are randomly selected to be included in the sample.

Front

What is a simple random sample?

Back

A simple random sample is a sampling method where every individual in the population has an equal chance of being selected, and every group of individuals of size n is equally likely to be chosen.

Front

What is the advantage of using a stratified random sample?

Back

A stratified random sample ensures that specific subgroups (strata) within a population are represented in the sample, leading to more accurate and reliable results.

Front

What is sampling bias?

Back

Sampling bias is any difference between the sample result and the truth about the population that tends to occur in the same direction whenever a specific sampling method is used.

Front

What is the purpose of stratification in sampling?

Back

Stratification in sampling is used to ensure that different segments of a population are adequately represented, which can improve the accuracy of the results.

Front

What is the difference between a sample and a population?

Back

A population is the entire group of individuals or instances that you want to draw conclusions about, while a sample is a subset of that population used to gather data.

Front

What is the role of randomization in sampling?

Back

Randomization helps to eliminate bias in the selection process, ensuring that every individual has an equal chance of being included in the sample.

Front

What is a multistage sample?

Back

A multistage sample is a sampling method that involves selecting a sample in multiple stages, often using a combination of different sampling methods.

Front

What is a convenience sample?

Back

A convenience sample is a non-probability sampling method where individuals are selected based on their easy availability and proximity to the researcher.