Final answer:
Psychologists should be familiar with ethical principles and guidelines to ensure their research and practice is conducted ethically.
Step-by-step explanation:
As ethics should always be a concern of psychologists, they should be familiar with ethical principles and guidelines that govern their profession. This includes ensuring the safety and informed consent of participants in their studies, avoiding bias in research and communication, and considering the ethical implications of their work on humans, animals, and the environment. Familiarity with ethical guidelines, such as those established by professional associations like the American Sociological Association, is essential for psychologists to conduct their research and practice in an ethical manner.