Using the three difference equations listed of the SIR model,
create a 3 column population model in Excel which shows the
population from time step 1 to time step 300. Let your starting
populations be: S[t] = 99, I[t] = 1, R[t] = 0. Let a = 0.001, and
let γ = 0.05.
a. Create a line graph showing the populations of S[t], I[t],
and R[t] through time.
b. Holding all other variables constant, try increasing and
decreasing the infection...