data fw13p03; title 'Chapter 13, exercise 3, test scores';
input  PROF $ SCORE;
cards;
A        74
A        78
A        68
A        72
A        76
A        69
A        71
A        74
A        77
A        71
B        75
B        80
B        87
B        81
B        72
B        73
B        80
B        76
B        68
B        78