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

In October the campus bookstore asked a random set of freshmen and seniors how much they hgad spent on textbooks that semester. The bookstore believes that the two groups spent the same amount. What is an appropriagte test value for a z test?
Freshmen - sample size 60, sample mean $280, population std dev $47; seniors - sample size 40, sample mean $290, population std. dev. $58
possible answers:
-0.08
11
-0.91
-1.23
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Top Answer

Dear Student Please find... View the full answer

8098346.doc

The test statistic is
Z=(xbar1-xbar2)/√[s1^2/n1+s2^2/n2]
=(280-290)/sqrt(47^2/60+58^2/40)
= - 0.91

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