ABC

(Pty) Ltd manufactures medical needles that are subjected to a quality test.

They use statistical process control (SPC) and the results (measured in grams)

are plotted on a chart. If the process average is 26,3 and the average range is

5, what will the control limits be if the sample size is n=6? The factor for

calculation of control limits is 0,483 for sample size, n=6. The sample average

is 27,05.

a     UCL = 28.715

b     The process is out of

control.

c     The process is under control.

d     LCL = 23.885

e     UCL = 63.031