An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and a 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 are shown here. 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 a 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 are shown here.  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 scores of the same customers before and after the training program. As such, it requires a paired t-test to determine if there is a significant difference in the mean scores before and after the training program. A one-sample test of means would be appropriate if we were comparing the mean score of the seven customers to a known population mean. A two-sample test of means would be appropriate if we were comparing the scores of two independent groups. A test of proportions would be appropriate if we were comparing the proportion of customers satisfied before and after the training program.

An Investigation of the Effectiveness of a Training Program to Improve