SCENARIO 15-4
a Factory Supervisor Is Concerned That the Time

question 8

Multiple Choice

SCENARIO 15-4
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.
$\begin{array} { r c c } \text { Hour } & \underline { X } & \underline { R } \\1 & 18.4 & 25 \\2 & 16.9 & 27 \\3 & 23.0 & 30 \\4 & 21.2 & 23 \\5 & 21.0 & 24 \\6 & 24.0 & 25 \\7 & 19.3 & 12 \\8 & 15.8 & 14 \\9 & 20.0 & 13 \\10 & 23.0 & 11\end{array}$ She also decides that lower and upper specification limit for the critical-to-quality variable should be
10 and 30 seconds, respectively.
-Referring to SCENARIO 15-4, suppose the supervisor constructs an X chart to see if the process is in-control.Which expression best describes this chart?

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Definitions:

Maturation

The process of development in which an individual matures or reaches full functionality, often used to describe the physical and psychological growth that occurs naturally with age.

Habituation

Tendency of the brain to stop attending to constant, unchanging information.

Learned Helplessness

A condition in which a person suffers from a sense of powerlessness, arising from traumatic events or persistent failure to succeed. It is thought to be one of the underlying causes of depression.

Contingency Blocking

A phenomenon in classical conditioning where a subject learns to associate a particular stimulus with an outcome, blocking the learning of an association with a new stimulus presented at the same time.