Use the sample data and confidence level given below to complete parts (@) through (d) A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n =985 and x= 591 who said "yes." Use a 90% confidence level. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. Round to three decimal places as needed.) b) Identify the value of the margin of error E E= (Round to three decimal places as needed) c) Construct the confidence interval.