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

question 194

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.
$\begin{array}{rcr}\text { Day }& \bar{X} \text { (inminutes) } &R\\1 & 58.5 & 5.1 \\2 & 47.6 & 7.8 \\3 & 64.3 & 6.1 \\4 & 60.6 & 5.7 \\5 & 63.7 & 6.2 \\6 & 57.5 & 6.0 \\7 & 55.0 & 5.4 \\8 & 54.9 & 6.1 \\9 & 55.0 & 5.9 \\10 & 62.7 & 5.0 \\11 & 61.9 & 7.1 \\12 & 60.0 & 6.5 \\13 & 58.3 & 5.9 \\14 & 52.0 & 5.2\end{array}$
-Referring to SCENARIO 15-3, suppose the analyst constructs an X chart to see if the production process is in-control.What is the upper control limit (UCL) for this chart?

• A)62.15
• B)60.95
• C)59.85
• D)58.75

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Definitions:

Popeye

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Stanley Milgram

A psychologist known for his seminal research on obedience to authority, including the famous Milgram experiment.

Obedience Study

The obedience study, most famously conducted by Stanley Milgram, was a series of experiments that demonstrated people's willingness to follow orders from an authority figure, even to the extent of causing pain to others.

Replications

The process of repeating research or experiments to verify results and ensure reliability and validity in scientific findings.