Question

Peter Ittig's department store, Ittig Brothers, is Amherst's largest independent clothier. The store receives an average of 8 returns per day.

Using z = 3, the control chart limits are:

what are UCL and LCL?

Answer 1

C-chart is the best suited for this since it is widely used to determine if the defects or returns are within the control limits or not.

Mean = average = 8 per day

Z=3

UcL = mean + 3[square root of mean]= 8+ 3 (Sq root of 8) = 16.48

LcL= mean - 3[ square foot of mean] = - 0.485

So the returns are within the control limits.