Sampling Methods a

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What is a controlled experiment?

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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.

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What is a cluster sample?

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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.

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What is a simple random sample?

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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.

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What is the advantage of using a stratified random sample?

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

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What is sampling bias?

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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.

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What is the purpose of stratification in sampling?

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

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What is the difference between a sample and a population?

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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.

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What is the role of randomization in sampling?

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

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What is a multistage sample?

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

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What is a convenience sample?

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