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During freshman year, Eric’s textbooks cost $89, $99, $119, $139, $189, $199, and $229. During his...

During freshman year, Eric’s textbooks cost $89, $99, $119, $139, $189, $199, and $229. During his senior year, he had to pay $109, 159, 179, 209, 219, 259, 279, $299, and $309 for his textbooks. Is this significant evidence that the median cost of textbooks is rising, according to the Mann-Whitney-Wilcoxon test?

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