Plastic keychains are being produced in a company named Hot Shot Plastics. SHOT
ID: 3176098 • Letter: P
Question
Plastic keychains are being produced in a company named Hot Shot Plastics. SHOT PLASTICS COMPANY Cunetime data of 25 samples, each size four, have been taken of are being produced in a company named Hot Shot when the DvD "Hot shot asi then trimmed to on the ines (which is the time for the plastic below the spreadsheet affect the edge quality of the has these data) tistical control of the durine the mold aim aurerimes using rand R 3S32 S5 2932971 270460 3105300 32.26942 3370124 3617198 24 A3315 2843856 3048251 32.43083 3016162 455051 2691885 2166133 3146936 2966928 2846547 28.2993/ 2899441 3u4511 3242677 26.102410 2947718 32.20079 2884273 30.5180 322364 3047 W04 3075 28.41126 31.25754 24.29473 35.46177 2985708 51833 31.24921 28.57954 35.00865 31.2359 3216161 31.41554 3580049 3.60909 2782131 31.57718 333398 32.20230 32.02005 32.71018 2937620 2691603 297777S 3392696 3378366 35.05322 329284 3.51641 213615 3096172 279630 3212483 2932853 3099709 3139641 459213 30.09172 32.43938 2784725 3070726 2699992 803034 3004835 2723709 22.01801 28.69624 3071869 260460 2930273 3083735 3082735 3190733 3040289 5932155 18 5.6 5.921 951Explanation / Answer
R-chart
R-bar=ER/k=5.932155
UCL=D4(R-bar)=(2.282)(5.932155)=13.537
LCL=D3(R-bar)=(0)(5.932155)=0
Since R-bar is within LCL and UCL, variation is in control
X-chart
X-dbar=Exbar/k=30.40289
UCL=30.40289+(0.729)(5.932155)=30.40289+4.3245=34.72739=34.73
LCL=30.40289-(0.729)(5.932155)= 30.40289-4.3245=26.07839=26.08
Since X-dbar is within LCL and UCL, process mean is in statistical control
AFTER ADDING THE 12 OBSERVATIONS:-
X-dbar is coming to 31.83002
R-bar is coming to 6.922568
R-chart
UCL=D4(R-bar)=(2.282)(6.922568)=15.797=15.80
LCL=D3(R-bar)=(0)(6.922568)=0
Since R-bar is within LCL and UCL, variation is in control
X-chart
X-dbar=Exbar/k=31.83002
UCL=31.83002+(0.729)(6.922568)= 31.83002+5.04655=36.88
LCL=31.83002-(0.729)(6.922568)= 31.83002-5.04655=26.78
Since X-dbar is within LCL and UCL, process mean is in statistical control