A new printing machine is set or calibrated to print 25 copies per minute. On each of four days, the printer's output is measured five times. The data will be used to construct a process control chart to monitor the printing process. The results of the printing process are in the following table. 
What is the value of the upper control limit factor for a range chart?
Definitions:
Random Variation
Natural fluctuations in the data occurring due to chance variations, which are inherent in any process or measurement.
Error Term
Represents the component of an observed variable that is not explained by the model used to estimate the variable, capturing the random variability in the data.
Time Trend
A pattern or direction in data that shows movement over a period of time.
Indicator Variable
A variable used in statistical models that takes on the value of 0 or 1 to indicate the absence or presence of some categorical effect or feature.
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