TABLE 18-3
a Quality Control Analyst for a Light

question 33

Multiple Choice

TABLE 18-3
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.
$$\begin{array} { l c c } \text { Day } & \bar { X } \text { (in minutes) } & R \\\hline 1 & 58.5 & 5.1 \\2 & 47.6 & 7.8 \\3 & 64.3 & 6.1 \\4 & 60.6 & 5.7 \\5 & 63.7 & 6.2 \\6 & 57.5 & 6.0 \\7 & 55.0 & 5.4 \\8 & 54.9 & 6.1 \\9 & 55.0 & 5.9 \\10 & 62.7 & 5.0 \\11 & 61.9 & 7.1 \\12 & 60.0 & 6.5 \\13 & 58.3 & 5.9 \\14 & 52.0 & 5.2\end{array}$$
-Referring to Table 18-3, suppose the analyst constructs an R chart to see if the variability in production times is in-control. What is the center line of this R chart?

• A) 6.0
• B) 6.9
• C) 4.8
• D) 7.1

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Definitions:

Social Problem

A condition or a pattern of behavior that is believed to warrant public concern and collective action.

Northern Hemisphere

The half of Earth that lies north of the equator, characterized by distinct seasonal changes.

Environmental Problems

Issues related to the degradation or destruction of the natural environment, including pollution, climate change, and loss of biodiversity.

Scientific Research

involves the systematic investigation and study of materials, sources, and phenomena, aiming to establish facts and reach new conclusions.