Discuss the below:
Q: A sample of 1000 items was placed in a test configuration such that all were operating under load. The data contains the number still running at the end of each day for 90 days.
a. Estimate the parameters of a Weibull failure time distribution.
b. Construct 90% confidence interval for those parameters.
c. Find the reliability of this item at 30 days.
| 1 |
1000 |
| 2 |
1000 |
| 3 |
1000 |
| 4 |
1000 |
| 5 |
1000 |
| 6 |
1000 |
| 7 |
1000 |
| 8 |
999 |
| 9 |
999 |
| 10 |
998 |
| 11 |
997 |
| 12 |
996 |
| 13 |
995 |
| 14 |
993 |
| 15 |
991 |
| 16 |
989 |
| 17 |
986 |
| 18 |
982 |
| 19 |
978 |
| 20 |
973 |
| 21 |
967 |
| 22 |
960 |
| 23 |
953 |
| 24 |
944 |
| 25 |
934 |
| 26 |
924 |
| 27 |
912 |
| 28 |
899 |
| 29 |
885 |
| 30 |
869 |
| 31 |
852 |
| 32 |
834 |
| 33 |
814 |
| 34 |
793 |
| 35 |
771 |
| 36 |
747 |
| 37 |
722 |
| 38 |
696 |
| 39 |
669 |
| 40 |
641 |
| 41 |
613 |
| 42 |
583 |
| 43 |
553 |
| 44 |
522 |
| 45 |
491 |
| 46 |
460 |
| 47 |
429 |
| 48 |
398 |
| 49 |
368 |
| 50 |
338 |
| 51 |
309 |
| 52 |
281 |
| 53 |
254 |
| 54 |
229 |
| 55 |
204 |
| 56 |
182 |
| 57 |
160 |
| 58 |
140 |
| 59 |
122 |
| 60 |
106 |
| 61 |
91 |
| 62 |
77 |
| 63 |
65 |
| 64 |
54 |
| 65 |
45 |
| 66 |
37 |
| 67 |
30 |
| 68 |
25 |
| 69 |
20 |
| 70 |
16 |
| 71 |
12 |
| 72 |
9 |
| 73 |
7 |
| 74 |
6 |
| 75 |
4 |
| 76 |
3 |
| 77 |
2 |
| 78 |
2 |
| 79 |
1 |
| 80 |
1 |
| 81 |
1 |
| 82 |
0 |
| 83 |
0 |
| 84 |
0 |
| 85 |
0 |
| 86 |
0 |
| 87 |
0 |
| 88 |
0 |
| 89 |
0 |
| 90 |
0 |