Parts Manufactured by an Injection Molding Process Are Subjected to a Compressive

question 44

Multiple Choice

Parts manufactured by an injection molding process are subjected to a compressive strength test.We monitor the compressive strength of the parts manufactured by this process using an and an s control chart.Samples of size 9 are taken at regular intervals,and their mean compressive strength (in psi = pounds per square inch) and standard deviation are plotted on the charts in time order.The overall mean of the sample means is = 81.2 psi,and the mean of the sample standard deviations is = 2.9 psi.The control chart constants are (partially) reproduced below. What is the value of the center line for the chart?

• A)18.8 psi
• B)78.7 psi
• C)81.2 psi
• D)138.6 psi

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Definitions:

Nonsystematic Variance

The portion of an asset's total variance that is attributable to factors unique to that specific asset, as opposed to broader market influences.

Market Index

A metric that measures the performance of a basket of securities intended to represent a particular market or segment of it, like the S&P 500 or NASDAQ.

Treynor-Black Model

A portfolio optimization model that integrates market equilibrium theory with security selection to enhance portfolio performance.

Nonsystematic Risk

The risk associated with an individual asset or company, which can be reduced through diversification, unlike systematic risk.