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. In the WAIS-R, we expect more wrong answers near the end, as the questions become more difficult, so high levels of intrasubtest scatter would be an unusual pattern of responses. Boone wondered if psychiatric patients have different response patterns than nonpatients have. He compared the intrasubtest scatter for 150 patients to population data from the WAIS-R standardization group. Assume that he had access both to means and standard deviations for this population. Boone reported that “the standardization group’s intrasubtest scatter was significantly greater than those reported for the psychiatric 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. Label your answers (1) through (3). 

e. What does Boone mean when he says significantly? 

f. State the null and research hypotheses for a twotailed test in both words and symbols. 

g. Imagine that you wanted to replicate this study. Based on the findings described in this exercise, state the null and research hypotheses for a onetailed test in both words and symbols.