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:

Neurotransmitters

Chemical substances in the nervous system that transmit signals across a synapse from one neuron to another, influencing mental states and behavior.

Alleles

Variants of a gene that occur at the same place on a chromosome, contributing to the diversity of traits in a population.

Dominant

Pertaining to a trait, allele, or characteristic that overrides or masks another in genetic expression.

Recessive

A term often used in genetics to describe a trait that is not expressed unless two copies of the gene are present.