Mary is researching the causes of alcohol use among college students, so she goes to live in a college dorm for a month to observe students and conduct in-depth interviews. This is an example of what type of research?

Shanna has a quiz covering research methods for both her biology and psychology classes. As she studies, she is continually getting information confused between the classes. The resulting memory loss is explained by

A) interference. B) retrieval failure. C) distortion. D) serial position effects.

The first symptom of syphilis is usually

a. a pus-like discharge from the penis or vagina b. a painless sore at the place where the bacterium entered the body c. a rash d. discomfort or pain during urination