Surveys (vs) Experiments

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What is a survey?

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

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What is an experiment?

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An experiment is a research method where a researcher manipulates one or more variables to observe the effect on another variable, often involving a control group.

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What is random sampling?

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Random sampling is a technique where every individual in a population has an equal chance of being selected for the survey, ensuring unbiased results.

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What is biased sampling?

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Biased sampling occurs when certain members of a population are more likely to be selected than others, leading to skewed results.

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What is voluntary response bias?

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Voluntary response bias happens when individuals choose to participate in a survey, often leading to an overrepresentation of strong opinions.

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What is undercoverage in sampling?

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Undercoverage occurs when some members of the population are inadequately represented in the sample, leading to incomplete data.

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What is a stratified sample?

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A stratified sample is a method where the population is divided into subgroups (strata) and random samples are taken from each stratum.

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What is a cluster sample?

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A cluster sample involves dividing the population into clusters (often geographically) and then randomly selecting entire clusters for the survey.

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What is an observational study?

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An observational study is a research method where the researcher observes subjects without manipulating any variables, often to identify correlations.

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What is a control group?

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A control group is a group in an experiment that does not receive the treatment or intervention, used for comparison against the experimental group.