Question: Problem 1 A technician in a quick oil change shop had the following service times (in minutes) for 20 randomly selected cars: Sample 1 2

Problem 1

A technician in a quick oil change shop had the following service times (in minutes) for 20 randomly selected cars:

Sample

1

2

3

4

3.4

3.5

3.4

3.6

3.1

3.4

3.5

3.5

3.1

3.3

3.3

3.7

3.2

3.6

3.3

3.4

3.2

3.2

3.5

3.8

  1. Construct the control charts for sample mean and sample range using the Alternate method (table below). Are any sample means and ranges beyond the control limits? If so, which one(s)?

Problem 1 A technician in a quick oil change shop

Sample 1 2 3 4 5 1 2 12.11 12.10 12.11 12.08 Observation 12.15 12.12 12.10 12.11 12.12 3 12.09 12.09 12.11 12.15 12.11 12.09 12.14 12.13 12.12 12.10 12.08 12.10 12.10 4 12.12 12.12 X 12.10

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