An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. Seven customers were randomly selected and completed both surveys. The results follow:
Customer Pre-training survey Post-training survey
A 6 8
B 5 5
C 10 10
D 7 10
E 6 8
F 5 6
G 2 8
What is the value of the test statistic, t?