Q15. 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. A defect rate in terms of High, Average or Low is calculated for each worker in a yearly evaluation. The results for 100 workers based on years of experiences are given in the table below.

Referring to the Table below, 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?

-----------------------------<1 Year------------<1-4Year---------------<5-9Year

High-------------------------6---------------------9---------------------------9

Average--------------------9---------------------19-------------------------23

Low--------------------------7---------------------8---------------------------10

a. chi-square test for independence

b. chi-square test for differences between two proportions (independent samples)

c. chi-square test for differences between two proportions (related samples)

d. chi-square test for differences among more than two proportions