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What is the primary use of a range control chart (R-chart) in statistical process control (SPC)?
O To assess the range of skills and performance levels within a team of employees.
O To observe the dispersion or variability of a process and detect any changes in the spread of data over time.
O To monitor the amount of time a process takes to complete and identify any changes in the speed of production.
O To track the cumulative financial range of profits and losses of a company over a fiscal year.