Scenario 1: In a research study on self-esteem, 30 middle
school students had a mean score of 81, with s = 7.5, and 30
high school students had a mean score of 72, with s = 9.3
Higher scores indicated higher self-esteem.
SE= 2.181
t-stat= 4.126
DF=29
Critical value assuming a= 0.05
2.045
