Internet speed Carsten, Matt, and Rainer designed an experiment to see how different environments affect the Internet speed around campus. They used their own Mac computer and a PC belonging to the school and tested each in two different libraries, the main and the science library.

Other factors included Time of Week (weekday or weekend), Time of Day (before or after 5 p.m.), and how busy the computer was (running other jobs or not). They measured the time it took to download a 50 Mb file from the school course management system.

a) Name the factors and levels.

b) How many runs will they need to run all treatment levels?

c) In what order should they perform all the runs?