The case study method involves an in-depth analysis of a single individual or a small group. Because it focuses on unique or specific instances rather than a representative population, it lacks a control group. This absence makes it difficult to establish cause-and-effect relationships or generalize findings to the broader population, as there is no baseline for comparison.

Job analysis is a systematic process used to gather information about the duties, responsibilities, and necessary skills for a specific position. While it provides the data needed to create job descriptions, the actual determination of selection criteria (such as specific interview questions or testing thresholds) is a subsequent step in the recruitment and selection process, not a direct objective of the analysis itself.

Establishing rapport is a critical component of ethical and effective psychological research. It involves building a relationship of mutual trust and cooperation between the researcher and the participants, which helps ensure that participants feel comfortable, provide honest data, and understand the nature of the study.

The scientific method relies on empirical evidence to validate or refute existing hypotheses. When new data is collected through systematic observation and experimentation, it is analyzed to determine if it supports current theories. If the empirical evidence contradicts existing models, scientists modify or replace those theories to better reflect the observed reality, ensuring the continuous advancement of scientific knowledge.

In the observational method, researchers study and analyze human behavior in a natural or controlled setting without interfering with the subjects. This method allows for the collection of data on behavior without influencing the outcome, providing valuable insights into human behavior and psychological phenomena as they occur in real-world contexts.

Action-oriented research is characterized by a focus on practical application and the implementation of solutions to real-world problems. Researchers committed to this approach prioritize the translation of theoretical knowledge into actionable steps, aiming to create tangible improvements or changes within a specific context or field of study.

Meta-analysis is a robust statistical technique used to combine the results of multiple independent studies to determine the overall effect size and effectiveness of a specific treatment. This approach is essential for synthesizing diverse research findings, allowing the student to identify consistent patterns or trends across large datasets that individual studies might not reveal on their own.

Observation is the foundational step of the scientific method. It involves the systematic gathering of information about a phenomenon to identify patterns or problems. Without careful, objective observation, researchers cannot formulate meaningful hypotheses or design effective experiments. This process ensures that scientific knowledge is grounded in empirical reality rather than assumptions, serving as the starting point for all subsequent scientific investigation and theory development.

An empirical statement is one that is based on direct observation, experience, or a standardized, verifiable formula. The definition of IQ as (mental age / chronological age) * 100 is a standardized psychometric formula used to quantify intelligence. While it is a definition, it functions as an empirical standard within the field of testing, allowing for consistent measurement and comparison across different populations.

A scientific theory is a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation. It provides a framework for understanding complex relationships.