SCENARIO 15-3
a Quality Control Analyst for a Light Bulb

question 248

Multiple Choice

SCENARIO 15-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic.Accordingly, the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.
$\begin{array}{ccc}\underline{\text { Day }}&\underline{ \bar{X} \text { (inminutes) }}& \underline{\text { R}}\\1 & 58.5 & 5.1 \\2 & 47.6 & 7.8 \\3 & 64.3 & 6.1 \\4 & 60.6 & 5.7 \\5 & 63.7 & 6.2 \\6 & 57.5 & 6.0 \\7 & 55.0 & 5.4 \\8 & 54.9 & 6.1 \\9 & 55.0 & 5.9 \\10 & 62.7 & 5.0 \\11 & 61.9 & 7.1 \\12 & 60.0 & 6.5 \\13 & 58.3 & 5.9 \\14 & 52.0 & 5.2\end{array}$
-Referring to SCENARIO 15-3, suppose the analyst constructs an R chart to see if the variability in production times is in-control.The R chart is characterized by which of the following?

• A)Increasing trend
• B)Decreasing trend
• C)In-control
• D)Points outside the control limits

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Definitions:

Seriation

Seriation is a cognitive skill that involves organizing objects in a sequential order based on a particular attribute, such as size or color.

Reversibility

In cognitive development, the understanding that objects can be changed and then returned to their original condition or state.

Moral Development

The process through which individuals develop proper attitudes and behaviors toward other people in society, based on social and cultural norms, rules, and laws.

Pre-Conventional

A stage in Kohlberg's theory of moral development where moral understanding is based on rewards and punishments.