review observational &experimental survey

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What is an experimental study?

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A research method where the researcher manipulates one variable to determine its effect on another variable, often involving a control group.

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What is an observational study?

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

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Define 'population' in research.

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A population consists of all subjects (human or otherwise) that are being studied.

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What is a census in research?

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A census involves collecting data from every member of the population.

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What is a sample survey?

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A sample survey collects data from a subset of the population to make inferences about the whole population.

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What is the response variable?

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The variable we expect to change in response to the explanatory variable.

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What is the explanatory variable?

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The variable that is manipulated or changed to observe its effect on the response variable.

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What is the difference between independent and dependent variables?

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Independent variables are manipulated by the researcher, while dependent variables are measured to see how they are affected.

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What is random assignment in experiments?

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Random assignment is the process of randomly assigning participants to different groups to ensure each group is similar.

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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 being tested.