TABLE 18-4
a Factory Supervisor Is Concerned That the Time

question 87

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.
$$\begin{array} { l l l l } \text { Hour } & \bar { X } & \text { R } \\\hline 1 & 18.4 & 25 \\2 & 16.9 & 27 & \\3 & 23.0 & 30 & \\4 & 21.2 & 23 & \\5 & 21.0 & 24 & \\6 & 24.0 & 25 & \\7 & 19.3 & 12 \\8 & 15.8 & 14 & \\9 & 20.0 & 13 & \\10 & 23.0 & 11 &\end{array}$$ 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 R chart to see if the variability in collection times is in-control. This R chart is characterized by which of the following?

• A) hugging the control limits
• B) cycles
• C) jump in the level around which the observations vary
• D) increasing trend

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Definitions:

Ejaculated

The process of expelling semen from the body, usually accompanying orgasm in males.

Myometrium

The middle, thick, muscular layer of the uterus.

Serous Fluid

A clear, watery bodily fluid that lubricates and reduces friction between tissues, such as in the lining of internal body cavities.

Uterus

A female reproductive organ in mammals, including humans, that holds and nourishes the embryo and fetus during pregnancy.