A process that is in control has a mean of

= 13.5

and a standard deviation of

= 0.9.

(a) Compute the upper and lower control limits if samples of size 4 are to be used.

UCL = __________

LCL = ___________

Construct the x chart for this process.

Sample Mean TI\" Sample Mean 7: 15.5 15.l.'.'lI 14.5 141} 13.5 131} 12.5 12.[} 15.5 15.[} 14.5 141} 13.5 131} 12.5 12.5 4 5 Sample Number 4 5 Sample Number H D 10 ED 0 Sample Mean f Sample Mean I" 15.5 15.11} ' 14.5 14.0 13.5 13.5 12.5 12.5 15.5 ' 151} 14.5 - 141} 13.5 13.[} 12.5 121} 4 5 Sample Number Sample Number 1E] Sample Mean f Sample Mean Tr 15.5 15.0 14.5 14.0 13.5 13.0 12.5 12.0 15.5 15.0 14.5 14.0 13.5 13.0 12.5 12.0 4 a Sample Number Sample Number UCL 10 Sample Mean T Sample Mean 1? 15.5 15.0 14.5 14.0 13.5 13.0 12.5 12.0 15-5 15.0 14.5 14.0 13.5 13.0 12.5 ' 12.0 Sample Number Sample Number Sample Mean Tr Sample Mean T 16.0 15.5 15.0 14.5 14.0 13.5 13.0 12.5 12-0 11.5 16.0 15.5' 15.0 14.5 14.0 13.5 13.0 12.5 12.0 11.5 4 6 Sample Number 4 6 Sample Number Sample Mean i Sample Mean T 16.0 15.5 15.0. 14.5 14.0 13.5 13.0 12.5 12.0 11.5 16.0 15.5 15.0 14.5 14.0 13.5 13.0 12.5 12.0 11.5 Sample Number 4 6 Sample Number 10