Question

A package delivery service adopted a new dispatching system to try to reduce the total

mileage required by its truck fleet to make deliveries. The new system would be worth

the cost if it reduced the fleet mileage by more than 10% from its current level of 2200

miles per day. The miles required for each of the 66 days under a trial of the new system

are recorded in column 1 of the Excel data file named “Package Delivery”. Using the

given data, please calculate and interpret the 93% confidence interval for the mean fleet

mileage. Based on your results, do you think the new dispatching system is worth its

cost? Show the necessary steps and explain your conclusion.

Miles	Day
2475	1
2433	2
2020	3
1975	4
1759	5
1582	6
1635	7
1492	8
1757	9
1690	10
1834	11
2261	12
1845	13
2122	14
1972	15
2056	16
2072	17
2028	18
2063	19
1795	20
1840	21
1762	22
1856	23
2030	24
1996	25
2153	26
2208	27
2049	28
2186	29
2214	30
1934	31
1959	32
1985	33
2026	34
2425	35
2194	36
2035	37
2190	38
2295	39
2152	40
1770	41
1666	42
1673	43
1804	44
1647	45
1754	46
1713	47
1867	48
2402	49
2030	50
1996	51
2153	52
2208	53
2049	54
2265	55
1863	56
1754	57
1761	58
1899	59
1734	60
1846	61
1803	62
1965	63
2528	64
2137	65
2101	66

Answer 1