Problem Set 8

Question 1

[Which of the following is true about process capability and stability?]

Answer 1

If common variation is high, a process could be stable but not capable

Question 2

[Statistical thinking is a decision-making skill demonstrated by the ability to draw
conclusions based on data. Which of the following is part of the conceptual foundation
of statistical thinking?]

Answer 2

All work occurs in a system of interconnected processes

Question 3

After taking numerous samples over time, management discovers that all samples have
similar means, and the data is consistently dispersed around each sample’s mean. These
findings indicate that this process variation is

Answer 3

random variation and is uncontrollable by management

Question 4

Example(s) of instances where 100% inspection is appropriate include

Answer 4

Acceptance sampling, where much material has been rejected in the past

In-process inspection, where workers have been asked to inspect their own work as
it is being performed.

Question 5

A machine is used to create multiple products by the same machines, processes, and
workers in sequence. Because there is not independence among the observations,
which method of sampling would be inappropriate?

Answer 5

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