In Book I of the Ethics, why does Aristotle argue that political science seems t

In Book I of the Ethics, why does Aristotle argue that political science seems to be the authoritative and master art? Be sure to include a description of how Aristotle ranks sciences in terms of a hierarchy, a discussion of good and ends, and the nature of such a science (i.e. is it a precise science or speculative science?)
Do not use no outside sources. Use quotes and cite them with page numbers, authors name and year it was published.