Examlex
Which of the following survey methods has the lowest return rate and does not allow for much flexibility?
Correlational Study
A type of research design where a researcher examines the relationship between two or more variables without manipulating them, determining whether and how they are related.
Double-Blind Experiment
A study or experiment in which neither the participants nor the researchers know who is receiving a particular treatment, to prevent bias.
Representative Sample
A fraction of a population that reliably reflects the traits of the entire group.
Random Sample
A method of selecting a subset of individuals from a population in which each person has an equal chance of being chosen.
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