Analytics Exercise: Hot Shot Plastics Company Plastic keychains are being produced in a company named Hot Shot Plastics. The plastic material is first molded and then trimmed to the required shape. The curetimes $($which is the time for the plastic to cool$)$ during the molding process affect the edge quality of the keychains produced. The aim is to achieve statistical control of the curetimes using X$-$ and R$-$charts $.$ Curetime data of $25$ samples, each of size four $,$ have been taken when the process is assumed to be in control $.$ These are shown as follows $.$