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

question 12

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 is the center line of this R chart?

• A)20.00
• B)20.56
• C)20.40
• D)24.00

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Definitions:

Economic Force

A factor that can influence the economy, such as inflation, unemployment rates, or technological advancements.

Consumer Ethnocentrism

The belief held by consumers that buying domestic products is morally right and superior to purchasing foreign products.

International Protectionism

This refers to the use of barriers and regulations by countries to protect their domestic industries from foreign competition.

Sociocultural Bias

Prejudice or discrimination based on societal norms or cultural differences.