Use the sample data and confidence 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 = 1004 and x = 511 who said "yes." Use a 99% confidence level. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. 0.509 (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.)

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