Types of Studies and Sampling Methods

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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 a Retrospective Study?

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A study that looks back at data collected in the past to find correlations or outcomes.

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What is a Segmented Bar Graph?

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A graphical representation that shows the proportion of different categories within a whole, often used to compare multiple groups.

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What is a Statistic in research?

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A numerical value that summarizes or describes characteristics of a 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 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 Simple Random Sampling?

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A sampling method where every member of the population has an equal chance of being selected.

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What is a Prospective Study?

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A study that follows participants forward in time to observe outcomes.

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What is a Randomized Experiment?

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An experiment where participants are randomly assigned to different groups to test the effects of a variable.

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What is Correlation?

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A statistical measure that describes the extent to which two variables change together.