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A primary indication for using a non-experimental design is when the research question is focused entirely on measuring a single variable rather than analyzing a statistical relationship between two or more variables. In these cases, researchers must use non-experimental methods to simply observe and describe this single characteristic without attempting to manipulate it.

Single-Variable Research

A specific example of a single-variable research question is investigating how accurate people are at forming first impressions. This type of inquiry requires a non-experimental approach because the researcher's objective is simply to measure and describe a single, isolated characteristic—the accuracy of the impressions—as it naturally occurs, rather than manipulating independent variables or exploring statistical relationships between multiple factors.

Example of Single-Variable Research: First Impressions

Which type of research design is required when a study is focused entirely on observing and describing a single variable without attempting to manipulate it?

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