How do I determine the null and alternative hypotheses if I want to determine wh

How do I determine the null and alternative hypotheses if I want to determine whether the mean salary of male and female employees is the same?
If I am using a level of significance of 0.05, what would the rejection rule for this test using the critical value approach if the degrees of freedom (df) for this test is given to be df = 97
How would I then calculate the t statistic

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