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

question 58

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)  R158.55.1247.67.8364.36.1460.65.7563.76.2657.56.0755.05.4854.96.1955.05.91062.75.01161.97.11260.06.51358.35.91452.05.2\begin{array} { l c r } \text { Day } & \bar { X } \text { (in minutes) } & \mathrm { R } \\\hline1 & 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 lower control limit (LCL) for this chart?


Definitions:

Nurse Reassess

The process where a nurse evaluates a patient's condition again to determine if the current care plan remains appropriate.

Isolation Precautions

Methods used in healthcare settings to prevent the spread of infectious agents from one person to another.

Morning Rounds

A daily routine in hospitals where medical staff visit each patient to review their condition, plan the day's treatment, and make adjustments to care.

Patient's Room

A designated space in a healthcare facility where a patient is placed to receive care and treatment.

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