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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 lower control limit for the
chart?
Activity Duration
The time period from the start to the end of an activity or task.
Early Finish
In project management, the earliest possible point in time when a task or project phase can be completed, assuming all goes according to plan.
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The latest possible time a task can begin without delaying the project completion date in project management.
Activity Duration
The total length of time required to complete a specific task or activity from start to finish.
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