Retake 4.1 Sampling & Surveys

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What is Sampling?

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Sampling is the process of selecting a subset of individuals from a population to estimate characteristics of the whole population.

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What is a Sample Size?

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Sample size refers to the number of observations or replicates included in a statistical sample.

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What is Random Sampling?

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Random sampling is a technique where each member of the population has an equal chance of being selected, ensuring unbiased representation.

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What is Convenience Sampling?

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Convenience sampling is a non-probability sampling method where participants are selected based on their easy availability and proximity to the researcher.

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What is Self Selected (Volunteer) Sampling?

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Self-selected sampling occurs when individuals choose to participate in a survey or study, often leading to bias as only those with strong opinions may respond.

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What is Stratified Sampling?

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Stratified sampling involves dividing the population into subgroups (strata) and randomly sampling from each stratum to ensure representation.

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What is Cluster Sampling?

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Cluster sampling is a sampling technique where the population is divided into clusters, and entire clusters are randomly selected for the sample.

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What is the difference between a Population and a Sample?

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A population includes all members of a defined group, while a sample is a subset of the population used for analysis.

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What is Bias in Sampling?

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Bias in sampling occurs when certain members of the population are systematically favored over others, leading to skewed results.

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What is a Survey?

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A survey is a method of collecting data by asking questions to a group of people to gather information about their opinions, behaviors, or characteristics.