While participating in a timed experiment, the participants in the experimental group had to leave the room because of a fire drill. Which potential threat to internal validity would this example illustrate according to Campbell and his colleagues?

If you score at the 50th percentile on an intelligence test, this means that

a. you correctly answered half of the questions on the test. b. you scored significantly below average on this test. c. you scored significantly below average on this test. d. half the people your age who took the test scored higher than you and half scored lower than you.

Which form of treatment is the most common level of mental health care?

A) Inpatient treatment B) Intensive outpatient treatment C) Partial hospitalization D) Outpatient treatment