An Educational Researcher Wants to Compare Four Different Teaching Methods $(\mathrm{F})$

Essay

An educational researcher wants to compare four different teaching methods A, B, C, and D which she wants to try on freshmen $(\mathrm{F})$ and juniors $(\mathrm{J})$ who have three different ability levels: low (L), medium (M), and high (H). List the 24 tests she must perform so that each teaching method is used once with each combination of grade level and ability level.