A Quality Analyst Wants to Construct a Control Chart for Determining

question 135

Multiple Choice

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: $$\begin{array} {r } { \text { Measurements } } \\\begin{array} { l l l l l } \text { Machine } & \\\hline \# 1 & 17 & 15 & 15 & 17 \\\# 2 & 16 & 25 & 18 & 25 \\\# 3 & 23 & 24 & 23 & 22\end{array}\end{array}$$ What is the estimate of the process mean for whenever it is under control?

• A) 16
• B) 19
• C) 20
• D) 21
• E) 23

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Definitions:

Northridge Earthquake

A magnitude 6.7 earthquake that struck the Los Angeles area of California, USA, on January 17, 1994.

Divergent Plate Boundary

A region where two tectonic plates move away from each other, leading to the creation of new crust as magma rises to the surface.

Offset Stream Channel

A stream or river channel that has been shifted laterally due to tectonic movement, creating a visible displacement along a fault line.

Active Faults

Faults that have moved recently (in geological terms) and are likely to experience future earthquakes.