A Manufacturer of Windows Produces One Type That Has a Plastic

question 115

Multiple Choice

A manufacturer of windows produces one type that has a plastic coating.The specification limits for the plastic coating are 30 and 70.From time to time the plastic coating can become uneven.Therefore,in order to keep the coating as even as possible,thickness measurements are periodically taken at four different locations on the window.15 subgroups were observed,each consisting of four thickness measurements,with the following results: mean of the means = $\overline {\overline{ x } }$

= 50.05,and average range = 8.85.Calculate the control limits for the X-bar chart.

• A)[41.2,58.9]
• B)[48.1,52.0]
• C)[43.6,56.5]
• D)[29.9,70.2]

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Definitions:

Easy-Going

A personality trait characterized by a relaxed, tolerant attitude and low levels of stress and worry.

Even-Tempered

Being even-tempered describes an individual who is usually calm and does not easily get angry or upset.

Depression

A condition affecting mental well-being, defined by an ongoing low mood or disinterest in pursuits, leading to major difficulties in everyday activities.

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