Here is the exercise set with many new proposed solutions, primarily from Sec. 6 and Sec. 11. The linear regression example that became quite messy during lecture today is included as a new Exercise 7.4, with a proposed solution in the solution section.
A small correction (Ex. 11.10) and one new proposed solution (Ex. 5.3). Here. Don't use too much time on Ex. 11.4. We have not directly developed the tools to solve it.