Three independent group students took an exam. The datapresented below represent the students’ test scores.
Group 1 Group 2 Group 3
95 79 65
98 76 68
80 60 70
77 88 87
99 69 66
90 66 72
Based on the post hoc (Tukey) test, which two groups have asignificant difference at the 0.05 level ?
a. group 1 and group 2
b. group 1 and group 3
c. group 2 and group 3
d. both a and b
