Use the sample data and condence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll. n = 1021 and x = 593 who said "yes." Use a 90% condence level. a Click the icon to view a table of z scores. 3) Find the best point estimate of the population proportion p. 0.581 (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.