Assume that out of 100 people chosen randomly in a survey in Portland 30% indicate that they vote democrat.
a) Estimate the proportion of people in Portland which vote Democrat. Give a 95% confidence interval for that proportion.
b.) Test on the 95%-level the hypothesis that there are more than 50% which vote democrat. Determine also the p-value.
Since I don't have the expectaction, variance or the standard deviation I am having trouble with parts a and b.