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. This analysis is an example of _____________.
A) A one-sample test of means
B) A two-sample test of means
C) A paired t-test
D) A test of proportions

Question

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.  This analysis is an example of _____________.
A) A one-sample test of means 
B) A two-sample test of means 
C) A paired t-test 
D) A test of proportions

Quizplus · Accepted Answer

This analysis involves comparing the pre-training and post-training scores of the same group of customers, which represents a paired design. Therefore, the appropriate statistical test to use is a paired t-test. Choice A and B do not apply as they involve comparing means between two separate groups. Choice D does not apply as it involves comparing proportions rather than survey scores.

An Investigation of the Effectiveness of a Training Program to Improve