Question: An operator takes samples every half hour from a machine. His four most recent samples are shown in the table below: Sample 9:00 15 14

An operator takes samples every half hour from a machine. His four most recent samples are shown in the table below:

Sample
9:00 15 14 15 12 16
9:30 18 16 20 16 15
10:00 16 17 15 16 18
10:30 19 14 11 15 16

A) Construct a mean chart for these four samples. What is the UCL of the mean chart? Do not round.

B) Construct a range chart. What is the UCL for the range chart? Do not round.

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