[4,8]
u
[1,3]
X
[14,18]
[5,9]
S
v
y
[12,16]
[7,12]
w
[10,16]
z
(b) Suppose that you find, in fact, that all nodes have the disease at time 20.
You're fairly certain that the disease couldn't have been introduced into this
group from other sources, and so you suspect instead that a value you're using as
the start or end of one of the time intervals is incorrect. Can you find a single
number, designating the start or end of one of the time intervals, that you could
change so that in the resulting network, it's possible for the disease to have owed
from s to every other node?
1.2. (5pts) In the SIR model, what is the most likely time to recover based on the
value of y?