You are comparing the number of parking tickets handed out at two different parking lots on campus.Assuming both populations are approximately normal with equal variances, is there a difference in mean yield (a = 0.05)?State the null and alternative hypothesis; the obtained test statistics, degrees of freedom, the critical test statistics and the decision on the null hypothesis.
Lot 1 Lot 2
Number 21 25
Sample Mean 3.27 2.53
Sample standard deviation 1.30 1.16
H0: ?1 - ?2 = 0; H1: ?1 - ?2 ? 0
t= 2.040
df=44; critical t= +/- 2.0154
Reject the null at the .05 level; there is evidence of a difference in means
H0: ?1 - ?2 = 0; H1: ?1 - ?2 ? 0
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