A poll conducted by the Siena College Research Institute in 2005 found that "81% of people surveyed would vote for a woman for president."
a. Is this enough information to report a point estimate for the proportion of all people who would vote for a woman for president?
b. What other information would be needed to set up a 95% confidence interval for the proportion of all people who would vote for a woman for president?
c. If the pollsters desired a margin of error no bigger than 0.02, how many people should be sampled?
d. Besides sample size, what other detail must be provided if conclusions are to be drawn in the form of a hypothesis test at the 0.05 level of significance?