$04.(1$ pt$)$

A test engineer samples $12$ diapers from a certain manufacturing process and respectively records $12,11,14,$

$13,9,6,10,7,4,8,5,$ and $10$ defects. What are the c$-$Chart control limits for a $1-$sigma level? Is the process

in control?

$($a$)$ UCLc $=12\mathrm{.}10,$LCLc $=6\mathrm{.}10$; process is in control

$($b$)$ UCLc $=18\mathrm{.}12,$LCLc $=0\mathrm{.}04$; process is in control

$($c$)$ UCLc $=12\mathrm{.}10,$LCLc $=6\mathrm{.}10$; process is out of control

$($d$)$ UCLc $=18\mathrm{.}12,$LCLc $=0\mathrm{.}04$; process is out of control