The results of a mathematics placement exam at two different

The results of a mathematics placement exam at two different campuses of Mercy College follow:
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What is the null hypothesis if we want to test the hypothesis that the mean score on Campus 1 is higher than on Campus 2?
H0: µ1 = 0
H0: µ2 = 0
H0: µ1 = µ2
H0: µ1 µ2

Solution

We do not use strict inequality in null, thus the mu1>mu2 will be alternative hypothesis, and null hyothesis is:

H0: µ1 µ2

Note that H0: µ1 = µ2 is also correct representation because we use this equality to find p-value.