Subject # Quality Control Assurance and Reliability

Variable control chart is

a$.$ none of the above

b$.$ provides many details as compared to attribute control chart

c$.$ Less costly

d$.$ Less time consuming

e$.$ Used by top level managers

Which of the following rules is correct for Identifying an Out$-$of$-$Control Process?

a$.$ A process is assumed to be out of control if a single point plot outside the control limits

b$.$ A process is assumed to be out of control if two out of three consecutive points fall outside the $2$ sigma warning limits on the same side of the centerline.

c$.$ A process is assumed to be out of control if four out of five consecutive points fall beyond the $1$sigma limit on the same side of the centerline.

d$.$ All of the options

If the control limits are at $\frac{+}{-}4$ sigma from mean

a$.$ then type II error is increased

b$.$ the type I error remain constant

c$.$ none

d$.$ then type I error is increased

e$.$ then type II error remain constant