Question: Boone (1992) examined scores on the Wechsler Adult Intelligence Scale-Revised (WAIS-R) for 150 adult psychiatric inpatients. He determined the "intrasubtest scatter" score for each inpatient. Intrasubtest scatter refers to patterns of responses in which respondents are almost as likely to get easy questions wrong as hard ones. High levels of intrasubtest scatter indicate unusual patterns of responses; because the questions start at low levels of difficulty and get increasingly more difficult, we would expect more wrong answers near the end. Boone wondered if psychiatric patients would have different response patterns than nonpatients. He compared the intrasubtest scatter for his sample of 150 patients to population data from the WAIS-R standardization group. Assume that he had access to both means and standard deviations for this population. Boone reported that "the standardization group's intrasubtest scatter was significantly greater than those reported for the psy - chiatric inpatients" and concluded that such scatter is normal.

a. What are the two populations?

b. What would the comparison distribution be? Explain.

c. What hypothesis test would you use? Explain.

d. Check the assumptions for this hypothesis test and label your answer (1) through (3).

e. What does Boone mean when he says significantly?