TABLE 18-4
a Factory Supervisor Is Concerned That

question 111

Multiple Choice

TABLE 18-4
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.
$\begin{array}{lll}\text { Hour } &\bar{X} &R\\\hline & & \\1 & 18.4 & 25 \\2 & 16.9 & 27 \\3 & 23.0 & 30 \\4 & 21.2 & 23 \\5 & 21.0 & 24 \\6 & 24.0 & 25 \\7 & 19.3 & 12 \\8 & 15.8 & 14 \\9 & 20.0 & 13 \\10 & 23.0 & 11\end{array}$
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 18-4, suppose the supervisor constructs an $\bar{X}$ chart to see if the process is in-control. What is the center line of the chart?

---

Definitions:

Tab Order Dialog

A feature in development environments that allows the creator to define the sequence in which input fields receive focus when the user navigates through a form using the tab key.

Auto Order

A feature in e-commerce or inventory management systems that automatically places orders based on specified criteria, such as stock levels.

Form Controls

Interactive elements such as text boxes, buttons, drop-down lists, and checkboxes that are used in forms to capture user input.

Applying Style

The process of applying a predefined set of formatting options to documents or application elements to ensure visual consistency and appeal.