Kira has been having trouble with her sleeping and eating patterns lately. Sometimes she sleeps from midnight until 6 a.m.; sometimes from noon until 7 p.m. She also eats at radically different times during the day. Her doctor should suspect that she is deficient in what hormone?

When investigators plan clinical research,

a. they must ask people if they would be willing to be in a placebo group. b. they have to evaluate the ethics of withholding treatment or providing nonstandard treatment to people. c. they typically do not have to consult with an IRB because the IRB does not deal with clinical research. d. they are allowed to study only those treatments that have been shown to be effective in treatments.

If an IQ test is valid, what should its scores be able to predict about someone?

a. Well-rounded personality b. Motor skills c. Brain volume d. Success in school