Question: 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 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

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