Unit 3 Review - Data Gathering

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What is stratified sampling?

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

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What is the purpose of a double-blind experiment?

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To eliminate a possible source of bias by keeping both the subjects and the diagnosing physician unaware of the treatment status.

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What is a representative sample?

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A sample that accurately reflects the characteristics of the population from which it is drawn.

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What is a survey?

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A method of data collection that involves asking people questions to gather information about their opinions or behaviors.

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Who is the target population in a survey?

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The entire group of individuals that a researcher is interested in studying.

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What is systematic sampling?

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A sampling method where every nth individual is selected from a list or queue.

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What is cluster sampling?

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A sampling method where the population is divided into clusters, and entire clusters are randomly selected.

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What is observational study?

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A research method where the researcher observes subjects in their natural environment without manipulation.

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What is an experiment in research?

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A study in which the researcher manipulates one or more variables to determine their effect on another variable.

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What is the placebo effect?

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A phenomenon where patients experience improvements in their condition simply because they believe they are receiving treatment.