Question
Asked Nov 18, 2019
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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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σ п, 460 440 (52) (63) 70 80 20 9.513 -2.10 ||

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Math

Statistics

Hypothesis Testing

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