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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
-0.08
11
-0.91
-1.23

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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