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

question 49

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 center line for this chart?

• A) 64.3
• B) 59.5
• C) 58.0
• D) 57.1

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Definitions:

Passive Voice

A grammatical construction where the object of an action becomes the subject of the sentence, often making the sentence less direct.

References Available

A statement indicating that the individual can provide contact information for people who can vouch for their abilities or character.

Online Searches

The act of using a web search engine to find information on the internet.

Promising Candidates

Individuals who show potential or suitability for a specific role or opportunity based on their skills, experience, or attributes.