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 153 156 169 165
M2 156 155 164 161
M3 154 145 148 149
M4 147 147 155 145
M5 165 166 157 159

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.

M1

c.

M5

d.

M4

e.

M3

f.

M2

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