For 1.1, using between() is more readable than year>=1970|year<1980. I will definitely use that for the following homework
Nice showing how to use kable to create pretty tables
Really insightful explanation for each exercise and give good reasons for the results
For the last table in 1.3, by using kable make the table look better but it's too long. Maybe using DT::datatable() can show a similar table but separate the data into different pages for readability
Peer-Review HW-02 for HJMcSorley
Remarks: