question 3.1, 3.2, 3.3 please and thank you.

Problem #3 (30 pts) Plastic keychains are being produced in a company named PLINE 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 36 samples, each of size four, is shown in the Excel file. Problem-3 worksheet. The first 24 samples were taken in January and February, and the last 12 samples were taken in March. This process is new, so the process standard deviation is not available. Questions 3.1 Prepare X and R-charts using these data with the standard 3-sigma controllimit constants A2, D3 and D4 (see the factors worksheet). 3.2 Analyze the charts and comment on whether the process appears to be in control and stable. 3.3 Is there any change in the process variation (e.g., the presence of random and assignable variation) from January through Marcha Briefly explain your answer. G H 16 A B D E F 1 Sample No. Observations 2 1 27.34667 27.50085 29.94412 28.21249 3 2 27.79695 26.15006 31.21295 31.33272 4 3 33.53255 29.32971 29.7046 31.053 5 4 37.98409 32.26942 31.91741 29.44279 6 5 33.82722 30.32543 28.38117 33.70124 7 6 29.68356 29.56677 27 23077 34.00417 8 7 32.6264 26.3203 32.07892 36.17198 9 8 30.29575 30.52868 24.43315 26.85241 10 9 28.43856 30.48251 32.43083 30.76162 11 10 28.2779 33.94916 30.47406 28.87447 12 11 26.91885 27.66133 31.46936 29.66928 13 12 28.46547 28.29937 28.99441 31.14511 14 13 28.84273 30.51801 32.23614 30.47104 15 14 30.75136 32.99922 28.08452 26.19981 16 15 31.25754 24.29473 35.46477 28.41126 17 31.24921 28.57954 35.00865 31.23591 18 17 31.41554 35.80049 33.60909 27.82131 19 18 32.2023 32.02005 32.71018 29.3762 20 19 26.91603 29.77775 33.92696 33.78366 21 20 35.05322 32.93284 31.51641 27.73615 22 21 32.12483 29.32853 30.99709 31.39641 23 22 30.09172 32.43938 27.84725 30.70726 24 23 30.04835 27.23709 22.01801 28.69624 25 24 29.30273 30.83735 30.82735 31.90733 26 31.6583 29.7833 31.8791 33.9125 27 26 34.4643 25.1848 37.76689 39.21143 28 27 41.34268 39.5459 29.5571 32.5735 29 28 29.4731 25.3784 25.0438 24.0035 30 29 25.4671 34.8516 30.1915 31.6222 31 30 46.25184 34.71356 41.41277 44.63319 32 31 35.4475 38.83289 33.0886 31.6349 33 32 34.55143 33.8633 35.18869 42.31515 34 33 43.43549 37.36371 38.85718 39.25132 35 34 37.05298 42,47056 35.90282 38.21905 36 35 38.57292 39.06772 32.2209 33.202 37 36 27.0305 33.6397 26.6306 42.79176 38 39 40 41 42 43 Problem-1.3 Problem-2 Problem-3 Factors 25 Problem-5 +