In a structured observation, each participant has an equal opportunity to display the behavior of interest because the researcher designs a specific set of conditions or tasks for all participants to engage in, providing a standardized environment for observation.

Correct Answer: C

Rationale: In a structured observation, each participant has an equal opportunity to display the behavior of interest because the researcher designs a specific set of conditions or tasks for all participants to engage in, providing a standardized environment for observation. This allows for fair and equitable observations across all participants, ensuring that each individual has the same opportunities to exhibit the behavior being studied. Choice A, clinical interview, typically involves a one-on-one interaction between a researcher and a participant focusing on collecting information through questions and answers, not providing equal opportunities for behavior display. Choice B, naturalistic observation, involves observing individuals in their natural environment without intervention or manipulation of conditions, which may not always ensure equal opportunities for behavior display. Choice D, case study, focuses on in-depth analysis of a single individual or a small group, providing detailed information but not necessarily ensuring equal opportunities for behavior display among participants.

Correct Answer: A

Rationale: The correct answer is A: ethnography. Ethnography is a research method borrowed from the field of anthropology. It involves observing and documenting behaviors and interactions in a naturalistic setting. This method allows researchers to gain insight into the cultural context and practices of a group through direct observation and participation. Choices B, C, and D are incorrect because clinical interviews, structured interviews, and systematic observations are research methods used in different contexts and fields, not borrowed specifically from anthropology.

Correct Answer: A

Rationale: In a correlational design, researchers gather information on individuals without altering their experiences. Correlational studies examine the relationship between two or more variables without any manipulation or control by the researchers. The researchers simply observe and measure the variables of interest without intervening in any way. Choices B, C, and D are incorrect because they describe aspects related to experimental designs rather than correlational designs. In an experimental design, researchers manipulate variables, assign participants to different treatment conditions, and control changes in the independent variable, which is not the case in correlational studies.

Correct Answer: D

Rationale: Dr. Anderson should use an experimental design to determine the cause-and-effect relationship between domestic violence and anger in children. In an experimental design, the researcher manipulates the independent variable (in this case, exposure to domestic violence) to observe its effect on the dependent variable (anger in children). This design allows for the establishment of a cause-and-effect relationship by controlling for other variables that may influence the outcomes. Observational design (Choice B) involves observing subjects in their natural environment without interference, correlational design (Choice C) examines the relationship between variables without manipulating them, and structured design (Choice A) typically refers to a study with predetermined procedures and data collection methods, which may not be suitable for establishing cause-and-effect relationships.

Correct Answer: B

Rationale: By using random assignment of participants to treatment conditions, investigators increase the chances that participants' characteristics will be equally distributed across treatment groups. Random assignment helps reduce the likelihood of bias in the selection process and ensures that any differences between groups are due to the treatment and not pre-existing group differences. Sequential, systematic, and correlational assignment methods do not provide the same level of assurance in distributing participants' characteristics equally across treatment groups.