A company has been the first choice for 70% the employment seekers in a certain region.

A company has been the first choice for 70% the employment seekers in a certain region. A new management of this company has implemented new policies and think that the proportion of the "first choice" for them has increased from 0.70. They are going to take a survey to test this statement

With the givin, how do I state the null and the alternative hypothesis.