AP PSYCHOLOGY

Detailed explanation-1: -A type of clinical trial in which neither the participants nor the researcher knows which treatment or intervention participants are receiving until the clinical trial is over. This makes results of the study less likely to be biased.

Detailed explanation-2: -A double-blind study is one in which neither the participants nor the experimenters know who is receiving a particular treatment. This procedure is utilized to prevent bias in research results. Double-blind studies are particularly useful for preventing bias due to demand characteristics or the placebo effect.

Detailed explanation-3: -In a double-blind experiment, neither the participants nor the researchers know which participants belong to the control group, as opposed to the test group. Only after all data have been recorded (and in some cases, analyzed) do the researchers learn which participants were which.

Detailed explanation-4: -The correct answer is a blind experiment.

Detailed explanation-5: -Answer and Explanation: In a b. double-blind study, neither the participant nor the researcher knows which group a participant has been assigned. It is called a double-blind because both groups of individuals involved in the study are unaware of what group they are in.