Math 449 Midterm
1. The health policy data displayed in the Table 1 comes from a study that includes interviews with
subjects from both rural and urban geographic regions:
Residence
Urban
Urban
Rural
Rural
Stress
Low
High
Low
High
Favorable Unfavorable
48

Math 490 - Midterm
1. The health policy data displayed in the Table 1 comes from a study that includes interviews with
subjects from both rural and urban geographic regions:
Residence
Urban
Urban
Rural
Rural
Stress
Low
High
Low
High
Favorable
48
96
55
7
U

HW due 4.1, 4.2, 4.4, 4.11, 4.14, 4.16, 4.17, 4.24
4.1
a) Show how software obtained = 0,068 when LI = 8.
Solution:
For a single explanatory quantitative variable X and a binary response variable Y, the
logistic regression model has a linear form, logit(x

3.3
a. State the prediction equation, and interpret the intercept and slope.
^ = 0.00255+0.00109x
The estimated probability of malformation is 0.00255 for non-alcoholic
(x=0), it increases (0.00109) times the score of alcohol consumption(x)
as x increases

HOMEWORK 6
3.13
a. The prediction equation of the Log Linear model is log( ) = 0.428 + 0.589(weight)
b. The estimated mean of Y for female Crabs is 2.74.
c. The confidence interval for is given by 0.589 1.96(0.065) = 0.5890.127, or (0.462, 0.717).
On the

HOMEWORK 3
Problem 2.2
a)
Sensitivity is the probability that the diagnostic test is positive given
that a subject has thedisease, that is, P(Y = 1|X = 1) Said
differently, sensitivity is the probability of success for the subjects in
row 1 of the conting

1
CATEGORICAL DATA ANALYSIS
Solutions to Selected Odd-Numbered Problems
Alan Agresti
Version March 15, 2006, c Alan Agresti 2006
This manual contains solutions and hints to solutions for many of the odd-numbered
exercises in Categorical Data Analysis, sec