Final answer:
Psychology departments routinely use college students as research participants, though questions about the generalizability of findings arise due to demographic limitations. Larger sample sizes are better in research, and experiments can be conducted on humans under ethical guidelines.
Step-by-step explanation:
The question pertains to the involvement of college students in psychological research studies. Psychology departments frequently seek student volunteers to be research participants, often relying on convenience samples like students enrolled in introductory courses. While this practice is common due to accessibility and ease, the representativeness of college students relative to the general population is questionable. College students often possess characteristics such as being younger, more educated, more liberal, and potentially less diverse than the broader population. Consequently, findings from such studies may have limited generalizability. Furthermore, the statement that experiments cannot be done on humans is false; human participants are used in psychological research while adhering to ethical guidelines and IRB regulations. Larger sample sizes in scientific experiments are generally preferred because they improve the reliability and validity of the research findings. Finally, a positive correlation does not inherently imply health benefits, but rather indicates a direct relationship between two variables.