TABLE 17-4
a Factory Supervisor Is Concerned That the Time

question 96

Multiple Choice

TABLE 17-4
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.
$\begin{array}{ccc} \underline { \text {Hour } }& \underline { \bar { X } } & \underline { R }\\1 & 18.4 & 25 \\2 & 16.9 & 27 \\3 & 23.0 & 30 \\4 & 21.2 & 23 \\5 & 21.0 & 24 \\6 & 24.0 & 25 \\7 & 19.3 & 12 \\8 & 15.8 & 14 \\9 & 20.0 & 13 \\10 & 23.0 & 11\end{array}$

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 17-4, suppose the supervisor constructs an $\bar { X }$ chart to see if the process is in-control. What are the lower and upper control limits of this chart?

• A) 10.00, 30.00
• B) 8.49, 32.03
• C) 5.39, 35.13
• D) 4.96, 35.56

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Definitions:

Parasympathetic Nervous System

A division of the autonomic nervous system that conserves energy by slowing the heart rate and increasing intestinal and gland activity, facilitating a state of rest and digest.

General Adaptation Syndrome

A three-stage response (alarm, resistance, exhaustion) that describes the body's short-term and long-term reactions to stress.

Distress

Negative stress, the kind felt during an illness or when going through a divorce.

Major Life Changes

Significant events or transitions in a person's life that require adaptation, such as marriage, divorce, moving to a new location, or significant loss.