1. BOD mini refrigerators are subjected to a temperature testing before they are sold to customers. Results from the last samples are shown in the table. Calculate and draw the necessary control chart(s) and determine whether the process is under control or not. If not, determine what the problem and what needs to be done. Sample Unit 2 1 2 Unit 1 30 32.6 31.9 32.4 31.1 30.6 30.3 34.2 Unit 3 30.8 30.7 30.7 33.5 Unit 4 33.5 30.8 32.2 33.6 Units 31.3 31 33.1 33.7 3 4