One month before an election in a metropolitan area, a poll of 660 randomly selected voters showed 54% planning to vote for a certain candidate. A week later it became known that he had shared inappropriate pictures of himself, and a new poll showed only 52% of 1010 voters supporting him. Do these results indicate a decrease in voter support for his candidacy. The z is 0.80. Does anyone understand what x1 and x2 are?