A Quality Analyst Wants to Construct a Control Chart for Determining

question 28

Multiple Choice

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: $$\begin{array} { c c c c c } \text { Machine } &&{ \text { Measurements } } \\\hline \# 1 & 17 & 15 & 15 & 17 \\\# 2 & 16 & 25 & 18 & 25 \\\# 3 & 23 & 24 & 23 & 22\end{array}$$
For upper and lower control limits of 23.29 and 16.71, which machine(s) , if any, appear(s) to have an out-of-control process mean?

• A) machine #1
• B) machine #2
• C) machine #3
• D) all of the machines
• E) none of the machines

---

Definitions:

Serosa

A smooth membrane consisting of a layer of cells that secrete serous fluid, lining various cavities and organs in the body, including the abdomen.

Muscularis

The muscularis is a layer of muscle found in various organs such as the gastrointestinal tract, responsible for movement and peristalsis.

Enteric Nervous System

A part of the nervous system that directly controls the gastrointestinal system, functioning independently of the central nervous system.

CNS

CNS, or Central Nervous System, refers to the complex part of the nervous system consisting of the brain and spinal cord, responsible for processing and sending out signals.