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.
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This is an open book exam.
1
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View Full Document1. 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 chisquare
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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 Spring '11
 ManWai's
 Epidemiology, Educational Psychology, estrogen, endometrial cancer, Pr > ChiSq, Estrogen Replacement Therapy

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