Are professors at private colleges paid more than professors at public colleges? The data in Table 3.1 were collected from a sample of 400 college professors whose rank, type of college, and salary were recorded.1 The number in each cell is the average salary (in thousands of dollars) for all professors who fell into that category. Use a graph to answer the question posed for this sample.

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Table 3.1 Salaries of Professors by Rank and Type of College Associate Full Assistant Professor Professor Professor Public Private 108.9 80.9 69.2 127.8 84.5 69.7 Source: Digest of Educational Statistics