A _____ study is when neither the researchers nor the participants know who is in the experimental group and who is in the control group.

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A double-blind study is when neither the researchers nor the participants know who is in the experimental group and who is in the control group. This helps to reduce bias and increase the validity of the results. A pseudo-experimental study is not a real experiment, but rather an observational study. A placebo control study involves giving one group a placebo (inactive substance) instead of the actual treatment, while the other group receives the real treatment. A single-blind study is when only the participants do not know which group they are in, but the researchers do.

A _____ Study Is When Neither the Researchers nor the Participants