TABLE 18-4
a Factory Supervisor Is Concerned That the Time

question 32

Multiple Choice

TABLE 18-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below.
$$\begin{array} { l l l l } \text { Hour } & \bar { X } & \text { R } \\\hline 1 & 18.4 & 25 \\2 & 16.9 & 27 & \\3 & 23.0 & 30 & \\4 & 21.2 & 23 & \\5 & 21.0 & 24 & \\6 & 24.0 & 25 & \\7 & 19.3 & 12 \\8 & 15.8 & 14 & \\9 & 20.0 & 13 & \\10 & 23.0 & 11 &\end{array}$$ She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds, respectively.
-Referring to Table 18-4, suppose the supervisor constructs an R chart to see if the variability in collection times is in-control. What are the lower and upper control limits for this R chart?

• A) 0, 42.28
• B) - 2.33, 43.13
• C) 0, 43.13
• D) - 2.28, 42.28

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Definitions:

Hospitalized Patients

Refers to individuals who are admitted to a hospital for treatment, observation, or surgery.

Medications

Substances used to diagnose, treat, or prevent disease and relieve symptoms, often referred to as medicine or drugs.

Lasting Recoveries

Long-term improvements or healings from physical or mental conditions, implying a sustained period of wellness.

Rehospitalized

The act of a patient being admitted to a hospital again after a previous discharge, often due to relapse or complication.