Instructions: Show complete works when answering all problems- don't just show final results. Otherwise, it will not be graded. Please do it by hand, but make it clear, neat and professional. Scan or take picture of your answer and upload it onto D21 dropbox before deadline. 1. AMOLED phone screens are subjected to a response time testing before they are sold to manufacturers. Results from the last samples are shown in the table. Create the necessary control chart(s) and determine whether the process is under control or not. If not, determine what the problem is and what needs to be done. Sample Unit 1 Unit 2 Unit 3 Unit 4 Units 71.1 71.3 70.8 72.2 73.6 # 73.5 1 2 3 4 70.6 70.3 74.2 70.8 70.7 70.7 73.5 71 73.1 73.7 70 72.6 71.9 72.4