Questions #2, #3, #4

control limits for mean UCL = X + A 2 R = ___196.06________________ LCL = XA2 R = ____96.44_______________

the control limits for range

UCL = D4 R = ______155.93_____________ LCL = D3 R = ____0______________

Sample Mean , = _____176.25________________ Sample Range, R = _______42________________

2. [2 Points) A sample of four observations now has the following times in seconds: 190, 190, 210, and 200. Is corrective action needed? Clearly justify your answer to receive credit. 3. [2 Points] A sample of four observations now has the following times in seconds: 50, 230, 190, and 185. Is corrective action needed? Clearly justify your answer to receive credit. 4. [2 Points) A sample of four observations now has the following times in seconds: 90, 240, 250, and 210. Is corrective action needed? Clearly justify your answer to receive credit. Maid Ann Linda Marie Michael X R Sample 1 120 130 200 165 153.75 80 Service time, sec. Sample 2 Sample 3 90 150 110 140 180 175 155 140 133.75 151.25 90 35