TABLE 18-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic.Accordingly,the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day. 
-Referring to Table 18-3,suppose the analyst constructs an 
chart to see if the production process is in-control.What is the lower control limit (LCL) for this chart?
Definitions:
Laboratory Setting
A controlled environment designed for scientific research, experiments, or testing.
Therbligs
The 18 basic motions used in motion study, developed by Frank and Lillian Gilbreth, to analyze the physical movements needed to perform a task efficiently.
Methods Time Measurement
A predetermined motion time system that is used to analyze the methods used by employees in the workplace, aiming to increase productivity by minimizing time waste.
Basic Motion
Refers to the fundamental movements or actions that are studied in time and motion studies to improve efficiency.
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