AP PSYCHOLOGY

Detailed explanation-1: -In a single-blind experiment, participants do not know which group they have been placed in until after the experiment has finished.

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: -Blinding, in research, refers to a practice where study participants are prevented from knowing certain information that may somehow influence them-thereby tainting the results.

Detailed explanation-4: -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-5: -Four major design types with relevance to user research are experimental, quasi-experimental, correlational and single subject. These research designs proceed from a level of high validity and generalizability to ones with lower validity and generalizability.