The temperature control unit on a commercial freezer in a 24 hour grocery store is set to maintain a mean temperature of 23 degrees Fahrenheit. The temperature varies, because people are constantly opening the freezer door to remove items, but should maintain the temperature fairly constant. In order to determine if the process of cooling is in control, the manager collected the following data for ten days. Each day he collected three readings per day. Work the problem, plot your charts. In the answer space: 1) provide the UCL and LCL for the xbar and r charts, 2) indicate whether process is in or out of control or needs investigated, 3) if it is not in control and/or need investigation, thoroughly discuss in a paragraph (as mentioned in lecture) what is wrong and what type of corrective action should be taken. Sample 9am 5pm 11 pm 1 25 28 23 2 22 23 28 3 20 24 25 4 21 26 22 5 21 23 27 6 26 25 27 7 21 23 25 8 25 23 22 9 22 24 24 10 29 24 26 For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac)