Use the sample data and confidence level given below to complete parts (a) through (4) A research Institute poil asked respondents If they felt vulnerable to identity theft. In the poll, n=912 and x=566 who said "yes. "Use a 95% confidence level Click the icon to view a table of z scores a) Find the best point estimate of the population proportion p. 621 (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.)