Say You work in the quality control department at Mars. In order to fit in the package, Snickers bars have a length requirement that needs to be met....

Say You work in the quality control department at Mars. In order to fit in the package, Snickers bars have a length requirement that needs to be met. The USL is: 4.3 inches and the LSL is: 3.6 inches. You've got some sample data, and you want to create control chart to monitor the current process. You've collected 10 samples with a subgroup of 8. What control chart should I use?