TABLE 14-3
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 14-3, 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:
Outdoor Temperature
The temperature of the air outside, which can vary widely depending on the weather, time of day, and geographic location.
Association
A relationship or link between two or more variables, where changes in one variable correspond to changes in the other.
Life Expectancy
The average period that an individual is expected to live, based on statistical averages.
Infant Mortality
The number of deaths of infants under one year old per 1,000 live births in a given region or period.
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