A college has decided to introduce the use of plus and minus with letter grades, as long as there is convincing evidence that more than 60% of the faculty favor the change. A random sample of faculty will be selected, and the resulting data will be used to test the relevant hypotheses. If p represents the proportion of all faculty who favor a change to plus–minus grading, which of the following pairs of hypotheses should be tested?
H0: p = 0.6 versus Ha: p < 0.6
or
H0: p = 0.6 versus Ha: p > 0.6
Explain your choice.