Dr.Greene was investigating the effects of weightlessness on general psychological functioning.Dr.Greene was able to locate three former astronauts who had experienced at least 10 days of weightlessness in space.These individuals were tested extensively and questioned in detail about their experiences.Dr.Greene's research represents:

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Dr. Greene's research represents a case study research design because he collected detailed information from a small sample of individuals (three former astronauts) who had experienced weightlessness in space. The study did not involve manipulation of any independent variable or random assignment of participants to groups, which are key elements of the experimental method of research. The study also did not involve surveying a large representative sample, which would be characteristic of survey research. Although the study did involve collecting data on the three individuals and examining their experiences for patterns, it did not involve testing hypotheses about the relationships between variables, which would be characteristic of correlational research.

DrGreene Was Investigating the Effects of Weightlessness on General Psychological