The Money Pit a . Lower Specification Calculation ( ) ( ) 13.066 5.00 0.64 3 4.21 ?? =

The Money Pit

a$.$ Lower Specification Calculation $()()$

$\mathrm{13.066}\mathrm{5.00}\mathrm{0.64}$

$3\mathrm{4.21}$

$\mathrm{â??}=$

Upper Specification Calculation $()()$

$\mathrm{25.00}\mathrm{13.066}\mathrm{0.94}$

$3\mathrm{4.21}$

$\mathrm{â??}=$

$()$min $\mathrm{0.64},\mathrm{0.94}\mathrm{0.64}$pkC $==$

$()$

$\mathrm{25}5\mathrm{0.79}$

$6\mathrm{4.21}$

pC $\mathrm{â??}$

$==$

b$.$ Because pC and pkC have values less than $1,$ the process is not capable of meeting

specifications. Yes, valid because the process is under statistical control, as can be

shown by plotting the last $\mathrm{15}$ observations on control charts. Ask students to

demonstrate that the process is in statistical control.

c$.$ The variability of the process must be greatly reduced. Also, the process should be

better centered between the specification limits$.$