A Manufacturer of Windows Produces One Type That Has a Plastic

question 72

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 = = 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:

Clinical Research

The branch of healthcare science that determines the safety and effectiveness of medications, devices, diagnostic products, and treatment regimens intended for human use.

Field Research

A method of collecting data through direct observation or interaction with subjects in their natural environments.

Data Collection

The process of gathering and measuring information on variables of interest in a systematic fashion, enabling one to answer research questions, test hypotheses, and evaluate outcomes.

Survey

A method for collecting quantitative or qualitative data in which a group of individuals is questioned about their opinions, behaviors, or knowledge.