maybe better quality
86.26 West Bettery Corp. has recently being companomenetlating as long as other name brands Jernes West head of the TOM program stipen, believes hele problem because banne we had an average would require a new level of tento West. Neverthehe concerned enoughouty by in checka. Previously agree took 2 hours to the new charts. Those who bong West Battery DataBaterie inhoud How 1 . ST 10 41 50 50 590 2 34 3 30 16 > 70 *** 5 40 4 2 50 24 7 30 e 23 50 4 8 10 19 . 300 ST SA 2 12 12 20 70 30 14 2 10 15 2 12 118 13 33 15 62 482 2 | 2 | 3 | 4 | 5 ** 40 10 20 18 64 524 10 S3 * * * * 10 20 60 41 21 5 . 22 16 se . . 16 21 3 so 26 3 25 30 30 with these sted. Wow more hours of which are on the following ble 27 S 28 01 Die man and the per and lower control forandringer 25 hours Has the mandating process behoort 4. Comment on the times tevex 6.2 By Dorosty betrece controllers www.woocomotor more the bow this would of technology nove te Welsh concerned hop houtine checks Powering the procesory Westtoo-beres for each of honothers for constant Thorntholowing Westery Dietary Life in 2 3 . 50 0 + 47 15 12 40 TO 1 LE . . 41 14 . . 4. 11 41 40 49 11 . 18 . . 1 18 10 with Wire wwwwww - Determined the per and lower and the the con Comment S6.26 West Battery Corp. has recently been receiving complaints from retailers that its 9-volt batteries are not lasting as long as other name brands. James West, head of the TQM program at West's Austin plant, believes there is no problem because his batteries have had an average life of 50 hours, about 10% longer than competitors' models. To raise the lifetime above this level would require a new level of technology not available to West. Nevertheless, he is concerned enough to set up hourly assembly line checks. Previously, after ensuring that the process was running properly, West took size n = 5 samples of 9-volt batteries for each of 25 hours to establish the standards for control chart limits. Those samples are shown in the following table: West Battery Data-Battery Lifetimes in hours) Hour Sample Taken Sample 2 3 5 R 1 151 50 49 50 150 50.0 2 2 45 47 70 46 36 48.8 134 3 135 48 139 47 43.8 15 8 | 4 155 70 | 1 50 151 51.2 40 18 18 5 49 38 64 47 468 28 16 50 62. 40 54 164 55.8 24 17 35 33 49 48 56 444 23 67 53 43 40 1506 27 | 8 | 8 | | R 19 144 57 46 47 4 46.6 8 10 70 45 150 47 41 50.0 20 10 SM 100 45 36 1500 20 12 0 154 47 47 0 1522 20 13 140 70 45 4 1.4 130 14 160 150 40 52 46 18 15 67 142 150 159 550 17 16 42 33 155 42 120 17 | | 40 401 50 470 120 18 64 150 57 50 1526 122 19 153 44 150 10 20 150 8 1 150 484 19 21 40 12 47 430 18 490 127 100 140 16 150 I 123 47 150 48 48.16 3 124 150 2 150 140 51 51 502 125 150 161 - SI 112 162 53.0 With these limits established, West now takes 5 more hours of data, which are shown in the following table: Sample Hour 1 2 3 4 5 26 48 52 39 57 61 27 45 53 48 46 66 28 63 49 50 G 53 29 57 70 2 45 61 30 38 46 54 52 a. Determine means and the upper and lower control limits for zand using the first 25 hours only) b. Has the manufacturing process been in control? c. Comment on the lifetimes observed. PX
