A researcher hypnotizes twenty volunteers an suggests to them that they will become more creative. Later the researcher compares stories these people write to stories written by 20 other people, and reports a difference. The main problem with this study is that it LACKS:

Question

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The main issue with the study is the lack of random samples (which would ensure that the selection of participants is unbiased and representative) and blind observations (which would prevent the observer's expectations from influencing the outcome). These elements are crucial for reducing bias and ensuring the validity of the study's findings.

A Researcher Hypnotizes Twenty Volunteers an Suggests to Them That