final2001 - Final Exam, December 2001 Categorical Data...

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Final Exam, December 2001 Categorical Data Analysis for Epidemiologic Studies, CHL5407H INSTRUCTIONS You have until 3 p.m. to complete this exam. Show all of your work so that partial credit can be given. Clearly state any assumptions you make in answering a question. This is an open book exam. 1
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1. Data from a study of 22 students suspected of having a learning disability are provided in Table 1. Children were classiFed by their homeroom teacher and by their school psychologist as to whether they have a learning disability. A primary goal of this study was to determine if, in the population, the proportion of students classiFed as having a learning disability differed between homeroom teachers and school psychologists. (a) A test for a difference in the proportion of learning disabled children com- paring teachers to psychologists was conducted using Pearson’s chi-square statistic. Was this an appropriate method of analysis? Provide a brief jus- tiFcation for your answer. (b) Teachers and psychologists disagreed about 13 students. Using just the data from these 13 students construct an approximate hypothesis test to test for a
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final2001 - Final Exam, December 2001 Categorical Data...

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