An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. To compare the differences they computed (post-training survey score - pre-training survey score). Seven customers were randomly selected and completed both surveys. The results follow.

CustomerPre-training SurveyPost-training SurveyA68B55C1010D710E68F56G28

For a 0.05 significance level, what is the critical value?

Select one:

a. 1.943

b. 1.895

c. 1.645

d. 2.447