Asked Nov 18, 2019

in october, the campus bookstore asked a random set of freshman and seniors how much they had spent on text books that semester. the bookstore believes that the two groups spent the same amount. what is an appropiate test value for a z test. 

A). 1.21    B). 0.22    C). 2.10    d).9.51

  freshmen seniors
sample size 80 70
sample mean $460 $440
population Std. dev. $52 $63



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The test value for ...


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σ п, 460 440 (52) (63) 70 80 20 9.513 -2.10 ||


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