TABLE 11-10
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 Table 11-10, what is the expected number of employees with less than 1 year of training time and a high defect rate?
A) 4.17
B) 4.60
C) 5.28
D) 9.17

Question

TABLE 11-10
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 Table 11-10, what is the expected number of employees with less than 1 year of training time and a high defect rate?
A) 4.17 
B) 4.60 
C) 5.28 
D) 9.17

Quizplus · Accepted Answer

According to the table, there are 36 workers with less than 1 year of experience and a defect rate of more than 60 per 1,000 parts. The expected number of employees can be calculated by multiplying the proportion of workers with less than 1 year of experience (36/100) by the total number of employees (100). This gives an expected value of 36*(36/100) = 12.96. Rounded to the nearest integer, the answer is 5. Therefore, the best choice is C, 5.

TABLE 11-10 One Criterion Used to Evaluate Employees in the Assembly Section