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One reads that a business school graduate with an undergraduate degree earns more than a high school graduate with no additional education, and a person with a master's degree or a doctorate earns even more. To test this, a random sample of 25 executives from companies with assets over $1 million was selected. Their incomes, classified by highest level of education, follow.
Income ($ thousands)
High School or less
Undergraduate Degree
Master's Degree or More
45
49
51
47
57
73
53
85
82
62
59
39
81
94
43
84
89
54
92
95
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