Instruction 18-10
a Factory Supervisor Is Concerned That the Time

question 113

Multiple Choice

Instruction 18-10
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 five individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.
She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
$\begin{array}{ll}\begin{array}{c}\text { Hour }\\\hline1\\2 \\3 \\4 \\5 \\6 \\7 \\8 \\9 \\10\end{array}\begin{array}{r}\overline{X}&R\\\hline{18.4} & 25 \\16.9 & 27 \\23.0 & 30 \\21.2 & 23 \\21.0 & 24 \\24.0 & 25 \\19.3 & 12 \\15.8 & 14 \\20.0 & 13 \\23.0 & 11\end{array}\end{array}$
-Referring to Instruction 18-10,suppose the supervisor constructs an R chart to see if the variability in collection times is in control.This R chart is characterised by which of the following?

• A)Decreasing trend.
• B)Increasing trend.
• C)In control.
• D)Individual outliers.

---

Definitions:

Browser

A software application used for accessing information on the World Wide Web, translating HTML files, and displaying content.

Microblogging Websites

Platforms that allow users to post short messages, comments, or updates, often used for social networking, instant thoughts sharing, and news updates.

Twitter

A social media platform that enables users to post short messages, known as tweets, to share news, thoughts, and updates.

Tumblr

A social media platform and microblogging site that allows users to post multimedia and other content to a short-form blog.