11-44. The 2013 graduating class from St. Francis University in Pennsylvania had the highest average student debt of all U.S. college graduates: $50,275. Second on the list was The Citadel in South Carolina, at $48,862. (Source: Susannah Snider, "10 Colleges that leave graduates with the most student loan debt," www.usnews.com, Feb. 17, 2015.) Suppose random samples of 75 St. Francis students and 205 Citadel students showed student loan standard deviations of $2,050 and $2,084, respectively. Using an alpha level of 0.10, test to determine whether the standard deviations for student loans at these two universities are equal.

11-45. Suppose the California State Highway Patrol conducted a study on a stretch of interstate highway south of San Francisco to determine what differences, if any, existed in driving speeds of cars licensed in California and cars licensed out of state. One of the issues to be examined was whether there was a difference in the variability of driving speeds for California and out-of-state cars. The data file Speed-Test contains speeds of 140 randomly selected California cars and 75 randomly selected out-of-state cars. Based on these sample results, can you conclude at the 0.05 level of significance that there is a difference between the variations in driving speeds?

California Cars	Out-of-State Cars
66	63
66	54
58	59
68	58
63	59
63	70
63	69
63	50
70	41
76	57
69	69
54	51
70	62
62	52
80	70
61	53
65	80
61	56
47	61
77	62
75	60
52	63
77	61
86	51
58	58
53	59
74	65
54	54
58	59
62	58
78	64
81	64
67	78
54	75
68	63
54	71
54	61
76	60
65	56
62	49
69	68
56	66
66	52
58	61
70	57
57	63
48	55
74	79
52	60
49	49
79	73
70	57
71	67
63	59
67	72
68	67
68	58
65	55
63	68
61	75
56	59
68	62
69	66
68	63
72	70
68	64
57	64
52	57
66	69
63	76
57	64
65	52
56	64
71	72
55	59
64
62
76
66
62
64
59
72
54
75
63
59
42
64
65
70
55
63
58
63
69
66
65
62
66
56
66
67
79
74
67
68
57
75
76
59
60
64
59
69
69
76
82
68
56
59
62
53
57
65
56
69
61
70
56
72
62
81
71
67
50
63
67
63
61