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TABLE 18-3
a Quality Control Analyst for a Light Bulb

question 60

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.
 Day Xˉ (in minutes)   R 158.55.1247.67.8364.36.1460.65.7563.76.2657.56.0755.05.4854.96.1955.05.91062.75.01161.97.11260.06.51358.35.91452.05.2\begin{array} { l c c } \text { Day } & \bar { X } \text { (in minutes) } & \text { 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 Xˉ\bar{X} chart to see if the production process is in-control. What is the upper control limit (UCL) for this chart?


Definitions:

Group Of Employees

A collective of individuals who work together in the same organization and contribute towards achieving the organization's goals and objectives.

Project Teams

Group similar to task forces that normally run their operation and have total control of a specific work project.

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