The following information relates to questions 1-3. In a survey of 400likelyvoters,215respondedthat they would vote for the incumbent, and 185...

The following information relates to questions 1-3. 

In a survey of 400 likely voters, 215 responded that they would vote for the incumbent, and 185 responded that they would vote for the challenger. Let p denote the fraction of all likely voters who preferred the incumbent at the time of the survey, and let 

Construct a 95% confidence interval for p. 

What will be the Upper and lower bound?