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In October, the campus bookstore asked a random set of freshmen and seniors how much they hap spent on textbooks that semester. The bookstore believes

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In October, the campus bookstore asked a random set of freshmen and seniors how much they hap spent on textbooks that semester. The bookstore believes that the two groups spent the same amount. What is an appropriate test value for a z test? Freshmen Seniors Sample size 60 60 Sample mean $320 $310 Population std. dev. $62 $73

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