SCENARIO 19-4 A Factory Supervisor Is Concerned That the Time It Takes

question 61

Multiple Choice

SCENARIO 19-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.
She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-Referring to Scenario 19-4,suppose the supervisor constructs an R chart to see if the variability in collection times is in-control.What are the lower and upper control limits for this R chart?

• A)- 2.33,43.13
• B)- 2.28,42.28
• C)0,42.28
• D)0,43.13

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Definitions:

Xylem Vessels

Tubular structures found in plants, responsible for transporting water and minerals from the roots to various parts of the plant.

Heartwood

The dense inner part of a tree trunk, yielding the hardest timber, providing strength, and often darker than the surrounding sapwood.

Vessels

Hollow tubes that carry fluids such as blood, lymph, or sap within an organism, including arteries, veins, and capillaries.

Mycorrhizae

Symbiotic associations between the roots of plants and a fungus, enhancing nutrient and water uptake for the plant and providing carbohydrates for the fungus.