
Solutions
Exercises of Chapter 1
1.1 Consider the DAG for the survey studied in this chapter and
shown in Figure 1.1.
1. List the parents and the children of each node.
2. List all the fundamental connections present in the DAG,
and classify them as either serial, divergent or convergent.
3. Add an arc from Age to Occupation, and another arc from
Travel to Education. Is the resulting graph still a valid BN?
If not, why?
1. Parents and children of each node are as follows.
•Age (A) has no parent, and Education (E) is its only child.
•Sex (S) has no parent, and Education (E) is its only child.
•Education (E) has two parents, Age (A) and Sex (S), and two
c