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 outputs from each machine are collected:

Machine Measurement 1 Measurement 2 Measurement 3 Measurement 4
M1 170 160 179 165
M2 168 166 170 167
M3 158 176 179 152
M4 175 155 164 154
M5 169 169 169 174

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.

Process is in Control

c.

M4

d.

M2

e.

M3

f.

M5

Clear my choice

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