In a survey of 400 likely voters, 245 responded that they would vote for

the incumbent and 155 responded that they would vote for the challenger. Let p

denote the fraction of all likely voter who preferred the incumbent at the time of the

survey, and let ^p the fraction of survey respondents who preferred the incumbent.

Did the survey contain statistically signicant evidence that the incumbent gets

60% of the preferences i.e. p = 0:60?