What statistical chart tracks the variation in a process and does not consider targets or goals?

The control chart is the correct choice because it specifically focuses on the variation within a process over time. It helps project managers and quality control professionals monitor whether a process is stable and operating within acceptable limits. Control charts plot data points against time to show variations and trends, allowing users to identify patterns, shifts, or outliers in the data without the influence of predetermined targets or goals.

By using a control chart, a team can see how variations fluctuate naturally in a process, which is essential for continuous improvement and quality assurance. This type of chart is particularly useful in Six Sigma and quality management methodologies, where understanding process variation is key to identifying issues that may need addressing.

The other options serve different purposes; histograms display the distribution of data points, a fishbone diagram is used for identifying potential causes of a problem, and a Gantt chart is a project management tool that illustrates the project schedule. None of these directly track process variation over time without the consideration of targets or goals in the same manner as a control chart does.