TABLE 17-3
a Quality Control Analyst for a Light Bulb

question 118

Multiple Choice

TABLE 17-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic. Accordingly, the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.

$\begin{array}{lcl} \underline { \text { Day } }& \underline { \bar { X } \text { (in minutes) }} & \underline { R }\\1 & 58.5 & 5.1 \\2 & 47.6 & 7.8 \\3 & 64.3 & 6.1 \\4 & 60.6 & 5.7 \\5 & 63.7 & 6.2 \\6 & 57.5 & 6.0 \\7 & 55.0 & 5.4 \\8 & 54.9 & 6.1 \\9 & 55.0 & 5.9 \\10 & 62.7 & 5.0 \\11 & 61.9 & 7.1 \\12 & 60.0 & 6.5 \\13 & 58.3 & 5.9 \\14 & 52.0 & 5.2\end{array}$

-Referring to Table 17-3, suppose the analyst constructs an $\bar { X }$ chart to see if the production process is in-control. What is the upper control limit (UCL) for this chart?

• A) 62.15
• B) 60.95
• C) 59.85
• D) 58.75

---

Definitions:

Conscious Mental Processes

Thoughts, perceptions, and feelings of which an individual is aware at any given moment.

Biological Model

A perspective in psychology and medicine that attributes psychological disorders and behaviors to biological factors, such as genetic inheritance, brain chemistry, and anatomy.

Abnormal Behavior

Patterns of emotion, thought, or action considered pathological for cultural, societal, or situational contexts.

Hereditary Factors

Genetic traits and characteristics passed down from parents to their offspring.