exercises 17, 19,21,22 (Note: These questions use the computer and we will work on them in the workshop.)
In exercise 17 from section 1.3, you computed an estimate for S, I, and R on the 31st day (t=30). Modify that program twice to use step sizes of 1.9 days and .1 days ( 1 day plus and minus .9) and compute new approximations for S, I, and R at t=30. What is the difference between the three approximations at t=30? Which two are closest to each other?