Statistical Quality Controls/Stats

13. A chemical manufacturing process is monitored by X-bar and S charts. Twenty five

subgroups of size 4 are collected to establish the control limits.

X-bar-bar =200

S-bar = 4.5

A. Calculate the control limits for both charts.

Ai) What is the LCL for the X-bar chart?

Answer:

14. A chemical manufacturing process is monitored by X-bar and S charts. Twenty five

subgroups of size 4 are collected to establish the control limits.

X-bar-bar =200

S-bar = 4.5

A. Calculate the control limits for both charts.

Aii) What is the UCL for the S chart?

Answer:

15. A chemical manufacturing process is monitored by X-bar and S charts. Twenty five

subgroups of size 4 are collected to establish the control limits.

X-bar-bar =200

S-bar = 4.5

B. Estimate the process standard deviation (3 points)

Answer: