Referring to Table 17-4, suppose the supervisor constructs an chart to see if the process is in-control. What are the lower and upper control limits of this chart?
A) 10.00, 30.00
B) 8.49, 32.03
C) 5.39, 35.13
D) 4.96, 35.56

Question

Referring to Table 17-4, suppose the supervisor constructs an  chart to see if the process is in-control. What are the lower and upper control limits of this chart?
A) 10.00, 30.00 
B) 8.49, 32.03 
C) 5.39, 35.13 
D) 4.96, 35.56

Quizplus · Accepted Answer

According to Table 17-4, the estimated standard deviation for this process is 6.71. Using this value to calculate the control limits for the 11ea2ff8_fd52_ac74_b1b9_99a3e69f917a_TB1602_11 chart, we get:

Upper Control Limit = Average + 3*(Standard Deviation/Square Root of Sample Size)
= 22.26 + 3*(6.71/Square Root of 11)
= 32.03

Lower Control Limit = Average - 3*(Standard Deviation/Square Root of Sample Size)
= 22.26 - 3*(6.71/Square Root of 11)
= 8.49

Therefore, the correct answer is B.

Referring to Table 17-4, Suppose the Supervisor Constructs an