Here is all the information that I'm given...can I calculate a stdev using this?

Near the time of an election, a cable news service performs an opinion poll of 1,000 prob-able voters. It shows that the Republican contender has an advantage of 52% to 48%. a. Develop a 95% confidence interval for the proportion favoring the Republican candidate. b. Estimate the probability that the Democratic candidate is actually leading.

520 mean 0.05 alpha 1000 N mean + - t(a/2) * stdev / n

Is there enough information to calculate?