A May 2000 Gallup poll found that 38% of a random sample of 1012 adults in the United States said that they believe in ghosts. a. Construct and interpret a 96% confidence interval to estimate the true...

A May 2000 Gallup poll found that 38% of a random sample of 1012 adults in the United States said that they believe in ghosts.


a. Construct and interpret a 96% confidence interval to estimate the true proportion of all U. S. adults who believe in ghosts.

b. What sample size would have been necessary to estimate within 2% the true proportion of adults who believe in ghosts with 95% confidence?