Please help me to solve this with a brief explanation. Use R if necessary. Thanks!

19.6. Three sets of treatment means \"if fOr students' grades in a course follow, where facmr A is student's major (A.: computer science; A2: mathematics) and faaor B is student's class afliation (BI: junior, Ba: senior; 33: graduate). Set 1 Set 2 Set 3 B] 32 33 31 32 33 8-. B; 33 A: 30 30 30 A1 75 30 90 A1 75 8'0 35 A; 9'0 90 90 A2 80 86 9 7 A 2 75 85 1'00 Prepare a treatment means plot for each set of p.9- to study interaCtiOn effects. Interpret each plot and state your ndings. If interactions are present, describe their nature and indicate whether they are important 0r unimponant