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 206 204 175 197
M2 176 195 175 178
M3 187 203 176 205
M4 182 177 187 190
M5 184 206 176 189

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

a.

M4

b.

M3

c.

M1

d.

Process is in Control

e.

M2

f.

M5

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