In: Statistics and Probability
Given the data below, a lower specification of 78.2, and an upper specification of 98.9, what is the long term process performance (Ppk)?
Data
101.4791
94.02297
95.41277
106.7218
90.35416
86.9332
94.87044
95.91265
93.98042
108.558
86.17921
85.01441
96.14778
92.59247
92.49536
87.4595
104.3463
90.57274
99.38992
80.61536
82.31772
97.05331
87.64293
103.3648
98.09292
87.72921
110.1765
86.76847
87.22422
94.88148
86.01183
91.43283
104.0907
97.77132
98.69138
95.55565
106.2402
95.96255
88.05735
100.2796
99.00995
86.18458
95.41366
99.32314
95.75733
88.82675
93.39986
98.34077
94.72198
99.14256
92.37767
94.94969
89.63531
87.56148
88.02731
97.57498
98.4039
98.18642
102.5057
88.69717
90.61504
87.80989
102.4578
92.72643
96.0759
92.81471
86.44152
101.1881
92.64199
84.96657
96.75944
94.76492
86.555
91.5101
97.21423
92.36803
90.68739
88.16595
94.48869
87.61221
101.9311
98.71314
109.3335
97.20268
88.36405
90.59582
89.18839
95.28564
99.59782
92.92415
96.54786
96.07842
93.63263
107.0558
93.20436
necessary calculation:-
x | (x- x bar)^2 |
101.4791 | 50.11932 |
94.02297 | 0.14185 |
95.41277 | 1.026513 |
106.7218 | 151.8366 |
90.35416 | 16.36558 |
86.9332 | 55.74713 |
94.87044 | 0.22169 |
95.91265 | 2.28932 |
93.98042 | 0.175712 |
108.558 | 200.4603 |
86.17921 | 67.57481 |
85.01441 | 88.08179 |
96.14778 | 3.056133 |
92.59247 | 3.265719 |
92.49536 | 3.62613 |
87.4595 | 48.16499 |
104.3463 | 98.93684 |
90.57274 | 14.64486 |
99.38992 | 24.90329 |
80.61536 | 190.0053 |
82.31772 | 145.9718 |
97.05331 | 7.042177 |
87.64293 | 45.65259 |
103.3648 | 80.37481 |
98.09292 | 13.64061 |
87.72921 | 44.4941 |
110.1765 | 248.9106 |
86.76847 | 58.23415 |
87.22422 | 51.48608 |
94.88148 | 0.232208 |
86.01183 | 70.35469 |
91.43283 | 8.801724 |
104.0907 | 93.91742 |
97.77132 | 11.3685 |
98.69138 | 18.41938 |
95.55565 | 1.336452 |
106.2402 | 140.1998 |
95.96255 | 2.442813 |
88.05735 | 40.22414 |
100.2796 | 34.5744 |
99.00995 | 21.25533 |
86.18458 | 67.48655 |
95.41366 | 1.028318 |
99.32314 | 24.24125 |
95.75733 | 1.843431 |
88.82675 | 31.05666 |
93.39986 | 0.99948 |
98.34077 | 15.53282 |
94.72198 | 0.103929 |
99.14256 | 22.49567 |
92.37767 | 4.088201 |
94.94969 | 0.302599 |
89.63531 | 22.69846 |
87.56148 | 46.75989 |
88.02731 | 40.60608 |
97.57498 | 10.08304 |
98.4039 | 16.03442 |
98.18642 | 14.34001 |
102.5057 | 65.70886 |
88.69717 | 32.51771 |
90.61504 | 14.32289 |
87.80989 | 43.42428 |
102.4578 | 64.93459 |
92.72643 | 2.799498 |
96.0759 | 2.809982 |
92.81471 | 2.511876 |
86.44152 | 63.33104 |
101.1881 | 46.08373 |
92.64199 | 3.089193 |
84.96657 | 88.98205 |
96.75944 | 5.568845 |
94.76492 | 0.133459 |
86.555 | 61.53775 |
91.5101 | 8.34921 |
97.21423 | 7.922142 |
92.36803 | 4.127277 |
90.68739 | 13.7805 |
88.16595 | 38.85839 |
94.48869 | 0.007937 |
87.61221 | 46.06866 |
101.9311 | 56.72349 |
98.71314 | 18.60663 |
109.3335 | 223.0214 |
97.20268 | 7.857257 |
88.36405 | 36.42786 |
90.59582 | 14.46874 |
89.18839 | 27.15671 |
95.28564 | 0.785067 |
99.59782 | 27.02149 |
92.92415 | 2.176953 |
96.54786 | 4.615021 |
96.07842 | 2.818437 |
93.63263 | 0.588243 |
107.0558 | 160.1794 |
93.20436 | 1.428599 |
sum=8967.963 | sum=3680.02 |
given that USL= 98.9 , LSL= 78.2
so our
for calculating Ppu:-
for calculating Ppl:-
we know that Ppk = min( Ppu , Ppl) = min(0.24 , 0.86) = 0.24
so, the long term process performance (Ppk) = 0.24 (rounded off to 2 decimal places)
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