10.6 A certain university has decided to introduce the use of plus and minus with letter grades, as long as there is 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 that favor a change to plus–minus grading, which of the following pair of hypotheses should the administration test:

H0: p 5 .6 versus Ha: p , .6 or H0: p 5 .6 versus Ha: p . .6 Explain your choice.