A Quality Analyst wants to construct a control chart for determining whether five machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, four units of putputs from each machine are collected:

Machine	Measurement 1	Measurement 2	Measurement 3	Measurement 4
M1	262	299	294	273
M2	268	288	251	253
M3	256	298	270	274
M4	284	259	286	280
M5	253	252	272	276

Does this process appear to be out of control? If yes, identify a machine using the factors of three sigma control limits.

a.

Process is in Control

b.

M2

c.

M1

d.

M4

e.

M3

f.

M5