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 320 311 322 314
M2 301 305 291 287
M3 293 299 287 320
M4 323 319 317 330
M5 284 326 320 338

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

a.

M1

b.

M4

c.

M5

d.

M3

e.

M2

f.

Process is in Control

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