Refer to the Lincolnville School District bus data.

a. Develop a 95% confidence interval for the mean bus maintenance cost.

b. Develop a 95% confidence interval for the mean bus odometer miles.

Data From Lincolnville School District bus:

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Engine Type (0=diesel) Maintenance Odometer Manufacturer Bluebird Thompson Thompson Bluebird Bluebird Keiser Bluebird Bluebird Keiser Bluebird Thompson Bluebird Bluebird Keiser Keiser Bluebird Kejser Bluebird Bluebird Keiser Bluebird Keiser Thompson Keiser Bluebird Thompson Bluebird Bluebird Bluebird Bluebird Kejser Kejser Thompson Bluebird Bluebird Bluebird Bluebird 418 Bluebird ID Сараcity Cost Age Miles Miles 135 55 3560 7 76426 11127 833 14 3920 90968 11112 671 1 14 6733 89792 11100 692 55 3770 8 93248 11048 200 55 5168 10 103700 11018 754 14 7380 14 146860 11003 540 1 55 3656 4 45284 10945 660 1 55 6213 6 64434 10911 353 1 55 4279 4 45744 10902 482 1 55 10575 10 116534 10802 398 4752 95922 10802 984 55 3809 87664 10760 977 55 3769 7 79422 10759 705 42 2152 4 47596 10755 767 55 2985 71538 10726 326 55 4563 107343 10724 120 42 4723 10 110320 10674 554 42 1826 4 44604 10662 1061 3527 695 55 2 23152 10633 1 55 4 46848 10591 861 1 55 9669 10 106040 10551 603 156 14 2116 6212 4 44384 10518 14 12 140460 73423 10473 427 1 55 6927 7 10355 883 1 55 1881 20742 10344 168 1 14 7004 7 83006 10315 954 42 5284 10 101000 10235 768 42 3173 71778 10227 490 1 55 10133 10 106240 10210 725 55 2356 57065 10209 45 55 3124 6. 60102 10167 38 1 14 5976 6. 61662 10140 314 5408 6 55 11 128117 10128 507 3690 7 72849 118470 10095 40 1 55 9573 10 10081 918 55 2470 53620 10075 387 1 55 6863 8. 89960 10055 55 4513 6. 104715 10000