Rather than adhere to any one theory of age-related change, most contemporary

A team of researchers has developed a structured interview to diagnose a new type of personality disorder. A series of trials to check the reliability of the structured interview yields a kappa of .75. How should the researchers view this result?

a. The kappa is so low they decide to abandon the project. b. The kappa is not at an acceptable level but encouraging for a new instrument that can be improved. c. Kappa is not the appropriate measure to be used when evaluating the reliability of a new diagnostic category. d. The kappa is at an acceptable level for well-established diagnostic instruments, so the interview is ready to be used in clinical settings.

Tess agrees to sleep in an artificial setting for three nights so that researchers can obtain information about her brain and muscle activity during sleep. She is taking part in a research method called _________

a. a single-blind study b. a double-blind study c. naturalistic observation d. laboratory observation