For a sample with s = 12, a score of X = 73 corresponds to z = –1.00 . What is the sample mean?

Danny is in the 80th percentile for height and the 50th percentile for weight at his two-year well-

child visit to the pediatrician. How would you interpret these percentile rankings? a. Danny is tall for his age, yet average for his weight. b. Eighty percent of all children Danny's age are taller than him and 50% of all children his age weigh more than he does. c. Danny is at risk for childhood obesity based on these percentiles. d. Danny is average for his age in both height and weight.

After a hundred patients with depression failed to respond to psychotherapy, they were given antidepressant drugs, and about one-fourth of them improved in the next few months. What can we conclude from these results, if anything? a. At least one-fourth of patients respond better to antidepressants than to psychotherapy. b. Switching from one type of treatment to another is helpful to many

patients. c. Patients should be allowed to choose what type of therapy they want. d. We can draw none of these conclusions.