SCENARIO 12-10
One Criterion Used to Evaluate Employees in the Assembly

SCENARIO 12-10
One criterion used to evaluate employees in the assembly section of a large factory is the number of defective pieces per 1,000 parts produced.The quality control department wants to find out whether there is a relationship between years of experience and defect rate.Since the job is repetitious,after the initial training period any improvement due to a learning effect might be offset by a loss of motivation.A defect rate is calculated for each worker in a yearly evaluation.The results for 100 workers are given in the table below.

-Referring to Scenario 12-10,which test would be used to properly analyze the data in this experiment to determine whether there is a relationship between defect rate and years of experience?

A) $\chi$ ² test for independence
B) $\chi$ ² test for differences among more than two proportions
C) Wilcoxon rank sum test for independent populations
D) Kruskal-Wallis rank test