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cross sectional method
researchers select a sample that includes people of different the participants in different age groups
naturalistic observation method
field study, they observe other people or animals in their natural habitats
single blind studies
participants do not know whether they are in the experimental group or the control group
double blind studies
a study in which both participants and experimenters are unaware of who receives the treatment
keep peoples thoughts and feelings private because then the people would be more honest
confidentiality - why?
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