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

question 239

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.
$$\begin{array} { cc c } \underline { \text { Hour } } & \underline { X } & \underline { R } \\1 & 18.4 & 25 \\2 & 16.9 & 27 \\3& 23.0 & 30 \\4 & 21.2 & 23 \\5 & 21.0 & 24 \\6 & 24.0 & 25 \\7&19.3&12\\8 & 15.8 & 14 \\9 & 20.0 & 13 \\10 & 23.0 & 11\end{array}$$ 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 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)- 2.33, 43.13
• B)- 2.28, 42.28
• C)0, 42.28
• D)0, 43.13

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Definitions:

Hallucinations

Sensory perceptions that appear to be real but are created by the mind, without an external stimulus, often seen in psychiatric conditions.

Sounds

Acoustic waves that propagate through air or another medium, which can be perceived when they make contact with an individual's or an animal's ear.

Voices

Refers to the sounds produced by humans as they speak or sing.

Sensory Experiences

Sensory experiences are perceptions gathered through the five senses - sight, hearing, smell, taste, and touch, shaping how individuals perceive the world around them.