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 lower control limit factor for a range chart?
Definitions:
Interaction Effect
A statistical concept in which the effect of two or more variables is not simply additive, indicating that these variables interact in predicting a particular outcome.
Main Effect
The overall impact of an independent variable on a dependent variable in an analysis, ignoring the effects of other independent variables.
F Tests
A class of statistical tests used to compare the variances of two or more samples to assess the equality of population variances.
Two-way ANOVA
A statistical test used to determine the effect of two nominal predictor variables on a continuous outcome variable, allowing for interactions between the factors to be analyzed.
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