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